diff --git a/apps/web/app/api/tournaments/[id]/generate-bracket/route.ts b/apps/web/app/api/tournaments/[id]/generate-bracket/route.ts
new file mode 100644
index 0000000..6f38805
--- /dev/null
+++ b/apps/web/app/api/tournaments/[id]/generate-bracket/route.ts
@@ -0,0 +1,347 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getServerSession } from 'next-auth';
+import { authOptions } from '@/lib/auth';
+import { db } from '@/lib/db';
+
+interface RouteContext {
+  params: Promise<{ id: string }>;
+}
+
+interface Team {
+  id: string;
+  clientId: string;
+  partnerId: string | null;
+  teamName: string | null;
+  seedNumber: number | null;
+  client: {
+    id: string;
+    firstName: string;
+    lastName: string;
+  };
+}
+
+interface MatchData {
+  tournamentId: string;
+  round: number;
+  position: number;
+  status: 'SCHEDULED' | 'IN_PROGRESS' | 'COMPLETED' | 'CANCELLED' | 'WALKOVER';
+  team1Players: string[];
+  team2Players: string[];
+}
+
+// Calculate next power of 2 that is >= n
+function nextPowerOf2(n: number): number {
+  let power = 1;
+  while (power < n) {
+    power *= 2;
+  }
+  return power;
+}
+
+// Calculate number of rounds for single elimination
+function calculateRounds(teamCount: number): number {
+  return Math.ceil(Math.log2(teamCount));
+}
+
+// Generate single elimination bracket
+function generateSingleEliminationBracket(
+  tournamentId: string,
+  teams: Team[]
+): MatchData[] {
+  const teamCount = teams.length;
+  const bracketSize = nextPowerOf2(teamCount);
+  const totalRounds = calculateRounds(bracketSize);
+  const byeCount = bracketSize - teamCount;
+
+  const matches: MatchData[] = [];
+
+  // Sort teams by seed number (if available) for proper seeding
+  const sortedTeams = [...teams].sort((a, b) => {
+    if (a.seedNumber === null && b.seedNumber === null) return 0;
+    if (a.seedNumber === null) return 1;
+    if (b.seedNumber === null) return -1;
+    return a.seedNumber - b.seedNumber;
+  });
+
+  // Create seeding positions for standard bracket seeding
+  // For 8 teams: [1,8,4,5,2,7,3,6] - this ensures top seeds meet later
+  const seedingOrder = createSeedingOrder(bracketSize);
+
+  // Map teams to their seeding positions
+  const teamSlots: (Team | null)[] = new Array(bracketSize).fill(null);
+
+  for (let i = 0; i < sortedTeams.length; i++) {
+    const position = seedingOrder[i] - 1; // Convert to 0-indexed
+    teamSlots[position] = sortedTeams[i];
+  }
+
+  // First round matches (round 1)
+  const firstRoundMatchCount = bracketSize / 2;
+
+  for (let pos = 0; pos < firstRoundMatchCount; pos++) {
+    const team1Index = pos * 2;
+    const team2Index = pos * 2 + 1;
+    const team1 = teamSlots[team1Index];
+    const team2 = teamSlots[team2Index];
+
+    const match: MatchData = {
+      tournamentId,
+      round: 1,
+      position: pos + 1,
+      status: 'SCHEDULED',
+      team1Players: team1 ? getTeamPlayerIds(team1) : [],
+      team2Players: team2 ? getTeamPlayerIds(team2) : [],
+    };
+
+    // If one team is a bye (null), mark as walkover and advance the other team
+    if (!team1 && team2) {
+      match.status = 'WALKOVER';
+      match.team1Players = []; // Bye
+    } else if (team1 && !team2) {
+      match.status = 'WALKOVER';
+      match.team2Players = []; // Bye
+    } else if (!team1 && !team2) {
+      // Both are byes - this shouldn't happen with proper seeding
+      match.status = 'WALKOVER';
+    }
+
+    matches.push(match);
+  }
+
+  // Create subsequent round matches (empty, to be filled as tournament progresses)
+  for (let round = 2; round <= totalRounds; round++) {
+    const matchesInRound = bracketSize / Math.pow(2, round);
+
+    for (let pos = 0; pos < matchesInRound; pos++) {
+      matches.push({
+        tournamentId,
+        round,
+        position: pos + 1,
+        status: 'SCHEDULED',
+        team1Players: [],
+        team2Players: [],
+      });
+    }
+  }
+
+  return matches;
+}
+
+// Get player IDs for a team (client + partner if exists)
+function getTeamPlayerIds(team: Team): string[] {
+  const ids = [team.clientId];
+  if (team.partnerId) {
+    ids.push(team.partnerId);
+  }
+  return ids;
+}
+
+// Create standard bracket seeding order
+// For power of 2 brackets, ensures that #1 seed meets #2 seed only in finals
+function createSeedingOrder(size: number): number[] {
+  if (size === 2) return [1, 2];
+
+  const order: number[] = [];
+  const halfSize = size / 2;
+  const prevOrder = createSeedingOrder(halfSize);
+
+  for (let i = 0; i < halfSize; i++) {
+    order.push(prevOrder[i]);
+    order.push(size + 1 - prevOrder[i]);
+  }
+
+  return order;
+}
+
+// Process walkover matches and advance winners
+async function processWalkovers(
+  tx: Omit<typeof db, '$connect' | '$disconnect' | '$on' | '$transaction' | '$use' | '$extends'>,
+  matches: { id: string; round: number; position: number; status: string; team1Players: string[]; team2Players: string[] }[]
+): Promise<void> {
+  const walkovers = matches.filter(m => m.status === 'WALKOVER');
+
+  for (const match of walkovers) {
+    // Determine winner (the team that's not empty)
+    const winner = match.team1Players.length > 0 ? match.team1Players : match.team2Players;
+
+    if (winner.length === 0) continue; // Both empty, no winner to advance
+
+    // Find the next round match this winner advances to
+    const nextRound = match.round + 1;
+    const nextPosition = Math.ceil(match.position / 2);
+
+    const nextMatch = matches.find(m => m.round === nextRound && m.position === nextPosition);
+    if (!nextMatch) continue; // Final match or not found
+
+    // Determine if this match feeds into team1 or team2 of next match
+    const isUpperBracket = match.position % 2 === 1;
+
+    if (isUpperBracket) {
+      await tx.match.update({
+        where: { id: nextMatch.id },
+        data: { team1Players: winner },
+      });
+    } else {
+      await tx.match.update({
+        where: { id: nextMatch.id },
+        data: { team2Players: winner },
+      });
+    }
+
+    // Update the walkover match with winnerId
+    await tx.match.update({
+      where: { id: match.id },
+      data: {
+        winnerId: winner[0], // Use first player as winner identifier
+        completedAt: new Date(),
+        status: 'COMPLETED',
+      },
+    });
+  }
+}
+
+// POST /api/tournaments/[id]/generate-bracket - Generate bracket/matches
+export async function POST(
+  request: NextRequest,
+  context: RouteContext
+) {
+  try {
+    const session = await getServerSession(authOptions);
+
+    if (!session?.user) {
+      return NextResponse.json(
+        { error: 'Unauthorized' },
+        { status: 401 }
+      );
+    }
+
+    // Check if user has admin role
+    const allowedRoles = ['SUPER_ADMIN', 'ORG_ADMIN', 'SITE_ADMIN'];
+    if (!allowedRoles.includes(session.user.role)) {
+      return NextResponse.json(
+        { error: 'Forbidden: Insufficient permissions' },
+        { status: 403 }
+      );
+    }
+
+    const { id } = await context.params;
+
+    // Verify tournament exists and belongs to user's organization
+    const tournament = await db.tournament.findFirst({
+      where: {
+        id,
+        organizationId: session.user.organizationId,
+      },
+      include: {
+        inscriptions: {
+          include: {
+            client: {
+              select: {
+                id: true,
+                firstName: true,
+                lastName: true,
+              },
+            },
+          },
+        },
+        matches: true,
+      },
+    });
+
+    if (!tournament) {
+      return NextResponse.json(
+        { error: 'Tournament not found' },
+        { status: 404 }
+      );
+    }
+
+    // Check tournament status is REGISTRATION_OPEN
+    if (tournament.status !== 'REGISTRATION_OPEN') {
+      return NextResponse.json(
+        { error: 'Tournament must be in REGISTRATION_OPEN status to generate bracket. Current status: ' + tournament.status },
+        { status: 400 }
+      );
+    }
+
+    // Check minimum inscriptions (at least 2 teams)
+    if (tournament.inscriptions.length < 2) {
+      return NextResponse.json(
+        { error: 'At least 2 teams must be registered to generate bracket' },
+        { status: 400 }
+      );
+    }
+
+    // Check if bracket already exists
+    if (tournament.matches.length > 0) {
+      return NextResponse.json(
+        { error: 'Bracket already exists. Delete existing matches first if you want to regenerate.' },
+        { status: 400 }
+      );
+    }
+
+    // Get tournament format from settings
+    const settings = tournament.settings as { tournamentFormat?: string } | null;
+    const format = settings?.tournamentFormat || 'SINGLE_ELIMINATION';
+
+    // Currently only supporting single elimination
+    if (format !== 'SINGLE_ELIMINATION' && format !== 'BRACKET') {
+      return NextResponse.json(
+        { error: `Bracket generation for ${format} format is not yet supported. Only SINGLE_ELIMINATION is currently available.` },
+        { status: 400 }
+      );
+    }
+
+    // Generate bracket matches
+    const matchData = generateSingleEliminationBracket(
+      id,
+      tournament.inscriptions as Team[]
+    );
+
+    // Create matches in transaction
+    const result = await db.$transaction(async (tx) => {
+      // Create all matches
+      const createdMatches = [];
+      for (const match of matchData) {
+        const created = await tx.match.create({
+          data: match,
+        });
+        createdMatches.push({
+          ...created,
+          status: match.status,
+        });
+      }
+
+      // Process walkovers and advance winners
+      await processWalkovers(tx, createdMatches as { id: string; round: number; position: number; status: string; team1Players: string[]; team2Players: string[] }[]);
+
+      // Update tournament status to IN_PROGRESS
+      await tx.tournament.update({
+        where: { id },
+        data: { status: 'IN_PROGRESS' },
+      });
+
+      // Fetch updated matches
+      return tx.match.findMany({
+        where: { tournamentId: id },
+        orderBy: [
+          { round: 'asc' },
+          { position: 'asc' },
+        ],
+      });
+    });
+
+    return NextResponse.json({
+      message: 'Bracket generated successfully',
+      tournamentStatus: 'IN_PROGRESS',
+      matches: result,
+      totalMatches: result.length,
+      totalRounds: Math.max(...result.map(m => m.round)),
+    });
+  } catch (error) {
+    console.error('Error generating bracket:', error);
+    return NextResponse.json(
+      { error: 'Failed to generate bracket' },
+      { status: 500 }
+    );
+  }
+}
diff --git a/apps/web/app/api/tournaments/[id]/inscriptions/[inscriptionId]/route.ts b/apps/web/app/api/tournaments/[id]/inscriptions/[inscriptionId]/route.ts
new file mode 100644
index 0000000..5c09110
--- /dev/null
+++ b/apps/web/app/api/tournaments/[id]/inscriptions/[inscriptionId]/route.ts
@@ -0,0 +1,301 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getServerSession } from 'next-auth';
+import { authOptions } from '@/lib/auth';
+import { db } from '@/lib/db';
+import { z } from 'zod';
+import { Decimal } from '@prisma/client/runtime/library';
+
+interface RouteContext {
+  params: Promise<{ id: string; inscriptionId: string }>;
+}
+
+// Validation schema for updating an inscription
+const updateInscriptionSchema = z.object({
+  player1Id: z.string().cuid('Invalid player 1 ID').optional(),
+  player2Id: z.string().cuid('Invalid player 2 ID').optional().nullable(),
+  teamName: z.string().max(100).optional().nullable(),
+  isPaid: z.boolean().optional(),
+  paidAmount: z.number().nonnegative().optional(),
+  seedNumber: z.number().int().positive().optional(),
+  notes: z.string().max(500).optional().nullable(),
+});
+
+// PUT /api/tournaments/[id]/inscriptions/[inscriptionId] - Update inscription
+export async function PUT(
+  request: NextRequest,
+  context: RouteContext
+) {
+  try {
+    const session = await getServerSession(authOptions);
+
+    if (!session?.user) {
+      return NextResponse.json(
+        { error: 'Unauthorized' },
+        { status: 401 }
+      );
+    }
+
+    const { id, inscriptionId } = await context.params;
+
+    // Verify tournament exists and belongs to user's organization
+    const tournament = await db.tournament.findFirst({
+      where: {
+        id,
+        organizationId: session.user.organizationId,
+      },
+    });
+
+    if (!tournament) {
+      return NextResponse.json(
+        { error: 'Tournament not found' },
+        { status: 404 }
+      );
+    }
+
+    // Verify inscription exists
+    const existingInscription = await db.tournamentInscription.findFirst({
+      where: {
+        id: inscriptionId,
+        tournamentId: id,
+      },
+    });
+
+    if (!existingInscription) {
+      return NextResponse.json(
+        { error: 'Inscription not found' },
+        { status: 404 }
+      );
+    }
+
+    const body = await request.json();
+
+    // Validate input
+    const validationResult = updateInscriptionSchema.safeParse(body);
+    if (!validationResult.success) {
+      return NextResponse.json(
+        {
+          error: 'Invalid inscription data',
+          details: validationResult.error.flatten().fieldErrors,
+        },
+        { status: 400 }
+      );
+    }
+
+    const { player1Id, player2Id, teamName, isPaid, paidAmount, seedNumber, notes } = validationResult.data;
+
+    // Build update data
+    interface InscriptionUpdateData {
+      clientId?: string;
+      partnerId?: string | null;
+      teamName?: string | null;
+      isPaid?: boolean;
+      paidAmount?: Decimal;
+      seedNumber?: number;
+      notes?: string | null;
+    }
+
+    const updateData: InscriptionUpdateData = {};
+
+    // Validate player 1 if changing
+    if (player1Id !== undefined && player1Id !== existingInscription.clientId) {
+      const player1 = await db.client.findFirst({
+        where: {
+          id: player1Id,
+          organizationId: session.user.organizationId,
+        },
+      });
+
+      if (!player1) {
+        return NextResponse.json(
+          { error: 'Player 1 not found or does not belong to your organization' },
+          { status: 404 }
+        );
+      }
+
+      // Check player 1 is not already registered in another inscription
+      const existingPlayer1 = await db.tournamentInscription.findFirst({
+        where: {
+          tournamentId: id,
+          id: { not: inscriptionId },
+          OR: [
+            { clientId: player1Id },
+            { partnerId: player1Id },
+          ],
+        },
+      });
+
+      if (existingPlayer1) {
+        return NextResponse.json(
+          { error: 'Player 1 is already registered in another team' },
+          { status: 400 }
+        );
+      }
+
+      updateData.clientId = player1Id;
+    }
+
+    // Validate player 2 if changing
+    if (player2Id !== undefined) {
+      if (player2Id === null) {
+        updateData.partnerId = null;
+      } else if (player2Id !== existingInscription.partnerId) {
+        const player2 = await db.client.findFirst({
+          where: {
+            id: player2Id,
+            organizationId: session.user.organizationId,
+          },
+        });
+
+        if (!player2) {
+          return NextResponse.json(
+            { error: 'Player 2 not found or does not belong to your organization' },
+            { status: 404 }
+          );
+        }
+
+        // Check player 2 is not already registered in another inscription
+        const existingPlayer2 = await db.tournamentInscription.findFirst({
+          where: {
+            tournamentId: id,
+            id: { not: inscriptionId },
+            OR: [
+              { clientId: player2Id },
+              { partnerId: player2Id },
+            ],
+          },
+        });
+
+        if (existingPlayer2) {
+          return NextResponse.json(
+            { error: 'Player 2 is already registered in another team' },
+            { status: 400 }
+          );
+        }
+
+        updateData.partnerId = player2Id;
+      }
+    }
+
+    if (teamName !== undefined) updateData.teamName = teamName;
+    if (isPaid !== undefined) updateData.isPaid = isPaid;
+    if (paidAmount !== undefined) updateData.paidAmount = new Decimal(paidAmount);
+    if (seedNumber !== undefined) updateData.seedNumber = seedNumber;
+    if (notes !== undefined) updateData.notes = notes;
+
+    const inscription = await db.tournamentInscription.update({
+      where: { id: inscriptionId },
+      data: updateData,
+      include: {
+        client: {
+          select: {
+            id: true,
+            firstName: true,
+            lastName: true,
+            email: true,
+            phone: true,
+            level: true,
+          },
+        },
+      },
+    });
+
+    // Get partner info if exists
+    let partner = null;
+    if (inscription.partnerId) {
+      partner = await db.client.findUnique({
+        where: { id: inscription.partnerId },
+        select: {
+          id: true,
+          firstName: true,
+          lastName: true,
+          email: true,
+          phone: true,
+          level: true,
+        },
+      });
+    }
+
+    return NextResponse.json({
+      ...inscription,
+      partner,
+    });
+  } catch (error) {
+    console.error('Error updating inscription:', error);
+    return NextResponse.json(
+      { error: 'Failed to update inscription' },
+      { status: 500 }
+    );
+  }
+}
+
+// DELETE /api/tournaments/[id]/inscriptions/[inscriptionId] - Remove inscription
+export async function DELETE(
+  request: NextRequest,
+  context: RouteContext
+) {
+  try {
+    const session = await getServerSession(authOptions);
+
+    if (!session?.user) {
+      return NextResponse.json(
+        { error: 'Unauthorized' },
+        { status: 401 }
+      );
+    }
+
+    const { id, inscriptionId } = await context.params;
+
+    // Verify tournament exists and belongs to user's organization
+    const tournament = await db.tournament.findFirst({
+      where: {
+        id,
+        organizationId: session.user.organizationId,
+      },
+    });
+
+    if (!tournament) {
+      return NextResponse.json(
+        { error: 'Tournament not found' },
+        { status: 404 }
+      );
+    }
+
+    // Only allow removing inscriptions if tournament is still in registration phase
+    if (!['DRAFT', 'REGISTRATION_OPEN'].includes(tournament.status)) {
+      return NextResponse.json(
+        { error: 'Cannot remove inscriptions after tournament has started' },
+        { status: 400 }
+      );
+    }
+
+    // Verify inscription exists
+    const existingInscription = await db.tournamentInscription.findFirst({
+      where: {
+        id: inscriptionId,
+        tournamentId: id,
+      },
+    });
+
+    if (!existingInscription) {
+      return NextResponse.json(
+        { error: 'Inscription not found' },
+        { status: 404 }
+      );
+    }
+
+    // Delete inscription
+    await db.tournamentInscription.delete({
+      where: { id: inscriptionId },
+    });
+
+    return NextResponse.json({
+      message: 'Inscription removed successfully',
+    });
+  } catch (error) {
+    console.error('Error removing inscription:', error);
+    return NextResponse.json(
+      { error: 'Failed to remove inscription' },
+      { status: 500 }
+    );
+  }
+}
diff --git a/apps/web/app/api/tournaments/[id]/inscriptions/route.ts b/apps/web/app/api/tournaments/[id]/inscriptions/route.ts
new file mode 100644
index 0000000..419cd74
--- /dev/null
+++ b/apps/web/app/api/tournaments/[id]/inscriptions/route.ts
@@ -0,0 +1,299 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getServerSession } from 'next-auth';
+import { authOptions } from '@/lib/auth';
+import { db } from '@/lib/db';
+import { z } from 'zod';
+
+interface RouteContext {
+  params: Promise<{ id: string }>;
+}
+
+// Validation schema for creating an inscription
+const createInscriptionSchema = z.object({
+  player1Id: z.string().cuid('Invalid player 1 ID'),
+  player2Id: z.string().cuid('Invalid player 2 ID').optional(),
+  teamName: z.string().max(100).optional(),
+});
+
+// GET /api/tournaments/[id]/inscriptions - List inscriptions for tournament
+export async function GET(
+  request: NextRequest,
+  context: RouteContext
+) {
+  try {
+    const session = await getServerSession(authOptions);
+
+    if (!session?.user) {
+      return NextResponse.json(
+        { error: 'Unauthorized' },
+        { status: 401 }
+      );
+    }
+
+    const { id } = await context.params;
+
+    // Verify tournament exists and belongs to user's organization
+    const tournament = await db.tournament.findFirst({
+      where: {
+        id,
+        organizationId: session.user.organizationId,
+      },
+    });
+
+    if (!tournament) {
+      return NextResponse.json(
+        { error: 'Tournament not found' },
+        { status: 404 }
+      );
+    }
+
+    const inscriptions = await db.tournamentInscription.findMany({
+      where: {
+        tournamentId: id,
+      },
+      include: {
+        client: {
+          select: {
+            id: true,
+            firstName: true,
+            lastName: true,
+            email: true,
+            phone: true,
+            level: true,
+          },
+        },
+      },
+      orderBy: {
+        registeredAt: 'asc',
+      },
+    });
+
+    // Enrich inscriptions with partner info if partnerId exists
+    const enrichedInscriptions = await Promise.all(
+      inscriptions.map(async (inscription) => {
+        let partner = null;
+        if (inscription.partnerId) {
+          partner = await db.client.findUnique({
+            where: { id: inscription.partnerId },
+            select: {
+              id: true,
+              firstName: true,
+              lastName: true,
+              email: true,
+              phone: true,
+              level: true,
+            },
+          });
+        }
+        return {
+          ...inscription,
+          partner,
+        };
+      })
+    );
+
+    return NextResponse.json(enrichedInscriptions);
+  } catch (error) {
+    console.error('Error fetching inscriptions:', error);
+    return NextResponse.json(
+      { error: 'Failed to fetch inscriptions' },
+      { status: 500 }
+    );
+  }
+}
+
+// POST /api/tournaments/[id]/inscriptions - Register team/player
+export async function POST(
+  request: NextRequest,
+  context: RouteContext
+) {
+  try {
+    const session = await getServerSession(authOptions);
+
+    if (!session?.user) {
+      return NextResponse.json(
+        { error: 'Unauthorized' },
+        { status: 401 }
+      );
+    }
+
+    const { id } = await context.params;
+
+    // Verify tournament exists and belongs to user's organization
+    const tournament = await db.tournament.findFirst({
+      where: {
+        id,
+        organizationId: session.user.organizationId,
+      },
+      include: {
+        _count: {
+          select: {
+            inscriptions: true,
+          },
+        },
+      },
+    });
+
+    if (!tournament) {
+      return NextResponse.json(
+        { error: 'Tournament not found' },
+        { status: 404 }
+      );
+    }
+
+    // Check tournament status is OPEN (REGISTRATION_OPEN)
+    if (tournament.status !== 'REGISTRATION_OPEN') {
+      return NextResponse.json(
+        { error: 'Tournament is not open for registration' },
+        { status: 400 }
+      );
+    }
+
+    // Check maxTeams not exceeded
+    if (tournament.maxPlayers && tournament._count.inscriptions >= tournament.maxPlayers) {
+      return NextResponse.json(
+        { error: 'Tournament has reached maximum number of teams' },
+        { status: 400 }
+      );
+    }
+
+    const body = await request.json();
+
+    // Validate input
+    const validationResult = createInscriptionSchema.safeParse(body);
+    if (!validationResult.success) {
+      return NextResponse.json(
+        {
+          error: 'Invalid inscription data',
+          details: validationResult.error.flatten().fieldErrors,
+        },
+        { status: 400 }
+      );
+    }
+
+    const { player1Id, player2Id, teamName } = validationResult.data;
+
+    // Verify player 1 exists and belongs to user's organization
+    const player1 = await db.client.findFirst({
+      where: {
+        id: player1Id,
+        organizationId: session.user.organizationId,
+      },
+    });
+
+    if (!player1) {
+      return NextResponse.json(
+        { error: 'Player 1 not found or does not belong to your organization' },
+        { status: 404 }
+      );
+    }
+
+    // Check player 1 is not already registered
+    const existingInscription = await db.tournamentInscription.findFirst({
+      where: {
+        tournamentId: id,
+        OR: [
+          { clientId: player1Id },
+          { partnerId: player1Id },
+        ],
+      },
+    });
+
+    if (existingInscription) {
+      return NextResponse.json(
+        { error: 'Player 1 is already registered for this tournament' },
+        { status: 400 }
+      );
+    }
+
+    // Verify player 2 if provided
+    if (player2Id) {
+      const player2 = await db.client.findFirst({
+        where: {
+          id: player2Id,
+          organizationId: session.user.organizationId,
+        },
+      });
+
+      if (!player2) {
+        return NextResponse.json(
+          { error: 'Player 2 not found or does not belong to your organization' },
+          { status: 404 }
+        );
+      }
+
+      // Check player 2 is not already registered
+      const existingInscription2 = await db.tournamentInscription.findFirst({
+        where: {
+          tournamentId: id,
+          OR: [
+            { clientId: player2Id },
+            { partnerId: player2Id },
+          ],
+        },
+      });
+
+      if (existingInscription2) {
+        return NextResponse.json(
+          { error: 'Player 2 is already registered for this tournament' },
+          { status: 400 }
+        );
+      }
+    }
+
+    // Create inscription
+    const inscription = await db.tournamentInscription.create({
+      data: {
+        tournamentId: id,
+        clientId: player1Id,
+        partnerId: player2Id || null,
+        teamName: teamName || null,
+        seedNumber: tournament._count.inscriptions + 1,
+        isPaid: false,
+        paidAmount: 0,
+      },
+      include: {
+        client: {
+          select: {
+            id: true,
+            firstName: true,
+            lastName: true,
+            email: true,
+            phone: true,
+            level: true,
+          },
+        },
+      },
+    });
+
+    // Get partner info if exists
+    let partner = null;
+    if (player2Id) {
+      partner = await db.client.findUnique({
+        where: { id: player2Id },
+        select: {
+          id: true,
+          firstName: true,
+          lastName: true,
+          email: true,
+          phone: true,
+          level: true,
+        },
+      });
+    }
+
+    return NextResponse.json(
+      {
+        ...inscription,
+        partner,
+      },
+      { status: 201 }
+    );
+  } catch (error) {
+    console.error('Error creating inscription:', error);
+    return NextResponse.json(
+      { error: 'Failed to create inscription' },
+      { status: 500 }
+    );
+  }
+}
diff --git a/apps/web/app/api/tournaments/[id]/matches/[matchId]/route.ts b/apps/web/app/api/tournaments/[id]/matches/[matchId]/route.ts
new file mode 100644
index 0000000..adc17a8
--- /dev/null
+++ b/apps/web/app/api/tournaments/[id]/matches/[matchId]/route.ts
@@ -0,0 +1,380 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getServerSession } from 'next-auth';
+import { authOptions } from '@/lib/auth';
+import { db } from '@/lib/db';
+import { z } from 'zod';
+
+interface RouteContext {
+  params: Promise<{ id: string; matchId: string }>;
+}
+
+// Validation schema for updating match result
+const updateMatchSchema = z.object({
+  score1: z.array(z.number().int().min(0)).optional(),
+  score2: z.array(z.number().int().min(0)).optional(),
+  winnerId: z.string().cuid('Invalid winner ID').optional(),
+  status: z.enum(['SCHEDULED', 'IN_PROGRESS', 'COMPLETED', 'CANCELLED', 'WALKOVER']).optional(),
+  courtId: z.string().cuid('Invalid court ID').optional().nullable(),
+  scheduledAt: z.string().datetime().optional().nullable(),
+  notes: z.string().max(500).optional().nullable(),
+});
+
+// Advance winner to next round
+async function advanceWinner(
+  tx: Omit<typeof db, '$connect' | '$disconnect' | '$on' | '$transaction' | '$use' | '$extends'>,
+  tournamentId: string,
+  currentRound: number,
+  currentPosition: number,
+  winnerPlayers: string[]
+): Promise<void> {
+  const nextRound = currentRound + 1;
+  const nextPosition = Math.ceil(currentPosition / 2);
+
+  // Find the next match
+  const nextMatch = await tx.match.findFirst({
+    where: {
+      tournamentId,
+      round: nextRound,
+      position: nextPosition,
+    },
+  });
+
+  if (!nextMatch) {
+    // No next match means this was the final
+    return;
+  }
+
+  // Determine if this match feeds into team1 or team2 of next match
+  // Odd positions go to team1, even positions go to team2
+  const isUpperBracket = currentPosition % 2 === 1;
+
+  if (isUpperBracket) {
+    await tx.match.update({
+      where: { id: nextMatch.id },
+      data: { team1Players: winnerPlayers },
+    });
+  } else {
+    await tx.match.update({
+      where: { id: nextMatch.id },
+      data: { team2Players: winnerPlayers },
+    });
+  }
+}
+
+// Check if tournament is complete
+async function checkTournamentComplete(
+  tx: Omit<typeof db, '$connect' | '$disconnect' | '$on' | '$transaction' | '$use' | '$extends'>,
+  tournamentId: string
+): Promise<boolean> {
+  // Find the final match (highest round)
+  const finalMatch = await tx.match.findFirst({
+    where: { tournamentId },
+    orderBy: { round: 'desc' },
+  });
+
+  if (!finalMatch) return false;
+
+  // Check if final match is completed
+  return finalMatch.status === 'COMPLETED';
+}
+
+// PUT /api/tournaments/[id]/matches/[matchId] - Update match result
+export async function PUT(
+  request: NextRequest,
+  context: RouteContext
+) {
+  try {
+    const session = await getServerSession(authOptions);
+
+    if (!session?.user) {
+      return NextResponse.json(
+        { error: 'Unauthorized' },
+        { status: 401 }
+      );
+    }
+
+    const { id, matchId } = await context.params;
+
+    // Verify tournament exists and belongs to user's organization
+    const tournament = await db.tournament.findFirst({
+      where: {
+        id,
+        organizationId: session.user.organizationId,
+      },
+    });
+
+    if (!tournament) {
+      return NextResponse.json(
+        { error: 'Tournament not found' },
+        { status: 404 }
+      );
+    }
+
+    // Check tournament is in progress
+    if (tournament.status !== 'IN_PROGRESS') {
+      return NextResponse.json(
+        { error: 'Tournament is not in progress' },
+        { status: 400 }
+      );
+    }
+
+    // Verify match exists
+    const existingMatch = await db.match.findFirst({
+      where: {
+        id: matchId,
+        tournamentId: id,
+      },
+    });
+
+    if (!existingMatch) {
+      return NextResponse.json(
+        { error: 'Match not found' },
+        { status: 404 }
+      );
+    }
+
+    // Can't update already completed matches
+    if (existingMatch.status === 'COMPLETED') {
+      return NextResponse.json(
+        { error: 'Cannot update a completed match' },
+        { status: 400 }
+      );
+    }
+
+    const body = await request.json();
+
+    // Validate input
+    const validationResult = updateMatchSchema.safeParse(body);
+    if (!validationResult.success) {
+      return NextResponse.json(
+        {
+          error: 'Invalid match data',
+          details: validationResult.error.flatten().fieldErrors,
+        },
+        { status: 400 }
+      );
+    }
+
+    const { score1, score2, winnerId, status, courtId, scheduledAt, notes } = validationResult.data;
+
+    // Validate winner is one of the teams
+    if (winnerId && status === 'COMPLETED') {
+      const team1HasWinner = existingMatch.team1Players.includes(winnerId);
+      const team2HasWinner = existingMatch.team2Players.includes(winnerId);
+
+      if (!team1HasWinner && !team2HasWinner) {
+        return NextResponse.json(
+          { error: 'Winner must be a player from one of the teams' },
+          { status: 400 }
+        );
+      }
+    }
+
+    // Validate court if provided
+    if (courtId) {
+      const court = await db.court.findFirst({
+        where: {
+          id: courtId,
+          site: {
+            organizationId: session.user.organizationId,
+          },
+        },
+      });
+
+      if (!court) {
+        return NextResponse.json(
+          { error: 'Court not found or does not belong to your organization' },
+          { status: 404 }
+        );
+      }
+    }
+
+    // Build update data
+    interface MatchUpdateData {
+      team1Score?: number[];
+      team2Score?: number[];
+      winnerId?: string | null;
+      status?: 'SCHEDULED' | 'IN_PROGRESS' | 'COMPLETED' | 'CANCELLED' | 'WALKOVER';
+      courtId?: string | null;
+      scheduledAt?: Date | null;
+      startedAt?: Date | null;
+      completedAt?: Date | null;
+      notes?: string | null;
+    }
+
+    const updateData: MatchUpdateData = {};
+
+    if (score1 !== undefined) updateData.team1Score = score1;
+    if (score2 !== undefined) updateData.team2Score = score2;
+    if (winnerId !== undefined) updateData.winnerId = winnerId;
+    if (status !== undefined) {
+      updateData.status = status;
+
+      // Set timestamps based on status
+      if (status === 'IN_PROGRESS' && existingMatch.status === 'SCHEDULED') {
+        updateData.startedAt = new Date();
+      } else if (status === 'COMPLETED') {
+        updateData.completedAt = new Date();
+      }
+    }
+    if (courtId !== undefined) updateData.courtId = courtId;
+    if (scheduledAt !== undefined) updateData.scheduledAt = scheduledAt ? new Date(scheduledAt) : null;
+    if (notes !== undefined) updateData.notes = notes;
+
+    // Use transaction to update match and advance winner
+    const result = await db.$transaction(async (tx) => {
+      // Update the match
+      const updatedMatch = await tx.match.update({
+        where: { id: matchId },
+        data: updateData,
+        include: {
+          court: {
+            select: {
+              id: true,
+              name: true,
+            },
+          },
+        },
+      });
+
+      // If match is completed with a winner, advance to next round
+      if (status === 'COMPLETED' && winnerId) {
+        const winnerTeam = existingMatch.team1Players.includes(winnerId)
+          ? existingMatch.team1Players
+          : existingMatch.team2Players;
+
+        await advanceWinner(
+          tx,
+          id,
+          existingMatch.round,
+          existingMatch.position,
+          winnerTeam
+        );
+
+        // Check if tournament is complete
+        const isComplete = await checkTournamentComplete(tx, id);
+        if (isComplete) {
+          await tx.tournament.update({
+            where: { id },
+            data: { status: 'COMPLETED' },
+          });
+        }
+      }
+
+      return updatedMatch;
+    });
+
+    // Fetch tournament status after update
+    const updatedTournament = await db.tournament.findUnique({
+      where: { id },
+      select: { status: true },
+    });
+
+    return NextResponse.json({
+      ...result,
+      tournamentStatus: updatedTournament?.status,
+    });
+  } catch (error) {
+    console.error('Error updating match:', error);
+    return NextResponse.json(
+      { error: 'Failed to update match' },
+      { status: 500 }
+    );
+  }
+}
+
+// GET /api/tournaments/[id]/matches/[matchId] - Get match details
+export async function GET(
+  request: NextRequest,
+  context: RouteContext
+) {
+  try {
+    const session = await getServerSession(authOptions);
+
+    if (!session?.user) {
+      return NextResponse.json(
+        { error: 'Unauthorized' },
+        { status: 401 }
+      );
+    }
+
+    const { id, matchId } = await context.params;
+
+    // Verify tournament exists and belongs to user's organization
+    const tournament = await db.tournament.findFirst({
+      where: {
+        id,
+        organizationId: session.user.organizationId,
+      },
+    });
+
+    if (!tournament) {
+      return NextResponse.json(
+        { error: 'Tournament not found' },
+        { status: 404 }
+      );
+    }
+
+    const match = await db.match.findFirst({
+      where: {
+        id: matchId,
+        tournamentId: id,
+      },
+      include: {
+        court: {
+          select: {
+            id: true,
+            name: true,
+            type: true,
+          },
+        },
+        booking: {
+          select: {
+            id: true,
+            startTime: true,
+            endTime: true,
+            status: true,
+          },
+        },
+      },
+    });
+
+    if (!match) {
+      return NextResponse.json(
+        { error: 'Match not found' },
+        { status: 404 }
+      );
+    }
+
+    // Enrich with player details
+    const allPlayerIds = [...match.team1Players, ...match.team2Players];
+    const players = await db.client.findMany({
+      where: {
+        id: { in: allPlayerIds },
+      },
+      select: {
+        id: true,
+        firstName: true,
+        lastName: true,
+        level: true,
+      },
+    });
+
+    const playerMap = new Map(players.map(p => [p.id, p]));
+
+    const team1 = match.team1Players.map(id => playerMap.get(id) || { id, firstName: 'Unknown', lastName: '', level: null });
+    const team2 = match.team2Players.map(id => playerMap.get(id) || { id, firstName: 'Unknown', lastName: '', level: null });
+
+    return NextResponse.json({
+      ...match,
+      team1Details: team1,
+      team2Details: team2,
+    });
+  } catch (error) {
+    console.error('Error fetching match:', error);
+    return NextResponse.json(
+      { error: 'Failed to fetch match' },
+      { status: 500 }
+    );
+  }
+}
diff --git a/apps/web/app/api/tournaments/[id]/route.ts b/apps/web/app/api/tournaments/[id]/route.ts
new file mode 100644
index 0000000..a05fa7e
--- /dev/null
+++ b/apps/web/app/api/tournaments/[id]/route.ts
@@ -0,0 +1,340 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getServerSession } from 'next-auth';
+import { authOptions } from '@/lib/auth';
+import { db } from '@/lib/db';
+import { z } from 'zod';
+import { Decimal } from '@prisma/client/runtime/library';
+import { Prisma } from '@prisma/client';
+
+interface RouteContext {
+  params: Promise<{ id: string }>;
+}
+
+// Validation schema for updating a tournament
+const updateTournamentSchema = z.object({
+  name: z.string().min(1).max(100).optional(),
+  description: z.string().max(500).optional().nullable(),
+  date: z.string().datetime().optional(),
+  endDate: z.string().datetime().optional().nullable(),
+  type: z.enum(['SINGLE_ELIMINATION', 'DOUBLE_ELIMINATION', 'ROUND_ROBIN', 'LEAGUE']).optional(),
+  category: z.string().max(50).optional().nullable(),
+  maxTeams: z.number().int().min(2).optional(),
+  price: z.number().nonnegative().optional(),
+  status: z.enum(['DRAFT', 'REGISTRATION_OPEN', 'REGISTRATION_CLOSED', 'IN_PROGRESS', 'COMPLETED', 'CANCELLED']).optional(),
+  rules: z.string().max(2000).optional().nullable(),
+  isPublic: z.boolean().optional(),
+});
+
+// Map API types to database types
+function mapTournamentType(type: string): 'AMERICANO' | 'MEXICANO' | 'BRACKET' | 'ROUND_ROBIN' | 'LEAGUE' {
+  const mapping: Record<string, 'AMERICANO' | 'MEXICANO' | 'BRACKET' | 'ROUND_ROBIN' | 'LEAGUE'> = {
+    'SINGLE_ELIMINATION': 'BRACKET',
+    'DOUBLE_ELIMINATION': 'BRACKET',
+    'ROUND_ROBIN': 'ROUND_ROBIN',
+    'LEAGUE': 'LEAGUE',
+  };
+  return mapping[type] || 'BRACKET';
+}
+
+// GET /api/tournaments/[id] - Get tournament with inscriptions count and matches
+export async function GET(
+  request: NextRequest,
+  context: RouteContext
+) {
+  try {
+    const session = await getServerSession(authOptions);
+
+    if (!session?.user) {
+      return NextResponse.json(
+        { error: 'Unauthorized' },
+        { status: 401 }
+      );
+    }
+
+    const { id } = await context.params;
+
+    const tournament = await db.tournament.findFirst({
+      where: {
+        id,
+        organizationId: session.user.organizationId,
+      },
+      include: {
+        site: {
+          select: {
+            id: true,
+            name: true,
+            slug: true,
+            address: true,
+            phone: true,
+            email: true,
+          },
+        },
+        inscriptions: {
+          include: {
+            client: {
+              select: {
+                id: true,
+                firstName: true,
+                lastName: true,
+                email: true,
+                phone: true,
+                level: true,
+              },
+            },
+          },
+          orderBy: {
+            registeredAt: 'asc',
+          },
+        },
+        matches: {
+          include: {
+            court: {
+              select: {
+                id: true,
+                name: true,
+              },
+            },
+          },
+          orderBy: [
+            { round: 'asc' },
+            { position: 'asc' },
+          ],
+        },
+        _count: {
+          select: {
+            inscriptions: true,
+            matches: true,
+          },
+        },
+      },
+    });
+
+    if (!tournament) {
+      return NextResponse.json(
+        { error: 'Tournament not found' },
+        { status: 404 }
+      );
+    }
+
+    return NextResponse.json(tournament);
+  } catch (error) {
+    console.error('Error fetching tournament:', error);
+    return NextResponse.json(
+      { error: 'Failed to fetch tournament' },
+      { status: 500 }
+    );
+  }
+}
+
+// PUT /api/tournaments/[id] - Update tournament details
+export async function PUT(
+  request: NextRequest,
+  context: RouteContext
+) {
+  try {
+    const session = await getServerSession(authOptions);
+
+    if (!session?.user) {
+      return NextResponse.json(
+        { error: 'Unauthorized' },
+        { status: 401 }
+      );
+    }
+
+    // Check if user has admin role
+    const allowedRoles = ['SUPER_ADMIN', 'ORG_ADMIN', 'SITE_ADMIN'];
+    if (!allowedRoles.includes(session.user.role)) {
+      return NextResponse.json(
+        { error: 'Forbidden: Insufficient permissions' },
+        { status: 403 }
+      );
+    }
+
+    const { id } = await context.params;
+
+    // Verify tournament exists and belongs to user's organization
+    const existingTournament = await db.tournament.findFirst({
+      where: {
+        id,
+        organizationId: session.user.organizationId,
+      },
+    });
+
+    if (!existingTournament) {
+      return NextResponse.json(
+        { error: 'Tournament not found' },
+        { status: 404 }
+      );
+    }
+
+    // If user is SITE_ADMIN, verify they have access to this site
+    if (session.user.role === 'SITE_ADMIN' && existingTournament.siteId && session.user.siteId !== existingTournament.siteId) {
+      return NextResponse.json(
+        { error: 'Forbidden: You do not have access to this tournament' },
+        { status: 403 }
+      );
+    }
+
+    const body = await request.json();
+
+    // Validate input
+    const validationResult = updateTournamentSchema.safeParse(body);
+    if (!validationResult.success) {
+      return NextResponse.json(
+        {
+          error: 'Invalid tournament data',
+          details: validationResult.error.flatten().fieldErrors,
+        },
+        { status: 400 }
+      );
+    }
+
+    const { name, description, date, endDate, type, category, maxTeams, price, status, rules, isPublic } = validationResult.data;
+
+    // Build update data
+    const updateData: Prisma.TournamentUpdateInput = {};
+
+    if (name !== undefined) updateData.name = name;
+    if (description !== undefined) updateData.description = description;
+    if (date !== undefined) updateData.startDate = new Date(date);
+    if (endDate !== undefined) updateData.endDate = endDate ? new Date(endDate) : null;
+
+    // Build settings update
+    let newSettings = existingTournament.settings as Prisma.JsonObject | null;
+
+    if (type !== undefined) {
+      updateData.type = mapTournamentType(type);
+      // Also update settings with the format
+      newSettings = {
+        ...(newSettings || {}),
+        tournamentFormat: type,
+      };
+    }
+    if (category !== undefined) {
+      newSettings = {
+        ...(newSettings || {}),
+        category,
+      };
+    }
+
+    if (newSettings && (type !== undefined || category !== undefined)) {
+      updateData.settings = newSettings;
+    }
+
+    if (maxTeams !== undefined) updateData.maxPlayers = maxTeams;
+    if (price !== undefined) updateData.entryFee = new Decimal(price);
+    if (status !== undefined) updateData.status = status;
+    if (rules !== undefined) updateData.rules = rules;
+    if (isPublic !== undefined) updateData.isPublic = isPublic;
+
+    const tournament = await db.tournament.update({
+      where: { id },
+      data: updateData,
+      include: {
+        site: {
+          select: {
+            id: true,
+            name: true,
+            slug: true,
+          },
+        },
+        _count: {
+          select: {
+            inscriptions: true,
+            matches: true,
+          },
+        },
+      },
+    });
+
+    return NextResponse.json(tournament);
+  } catch (error) {
+    console.error('Error updating tournament:', error);
+    return NextResponse.json(
+      { error: 'Failed to update tournament' },
+      { status: 500 }
+    );
+  }
+}
+
+// DELETE /api/tournaments/[id] - Delete tournament (only if DRAFT status)
+export async function DELETE(
+  request: NextRequest,
+  context: RouteContext
+) {
+  try {
+    const session = await getServerSession(authOptions);
+
+    if (!session?.user) {
+      return NextResponse.json(
+        { error: 'Unauthorized' },
+        { status: 401 }
+      );
+    }
+
+    // Check if user has admin role
+    const allowedRoles = ['SUPER_ADMIN', 'ORG_ADMIN', 'SITE_ADMIN'];
+    if (!allowedRoles.includes(session.user.role)) {
+      return NextResponse.json(
+        { error: 'Forbidden: Insufficient permissions' },
+        { status: 403 }
+      );
+    }
+
+    const { id } = await context.params;
+
+    // Verify tournament exists and belongs to user's organization
+    const existingTournament = await db.tournament.findFirst({
+      where: {
+        id,
+        organizationId: session.user.organizationId,
+      },
+      include: {
+        _count: {
+          select: {
+            inscriptions: true,
+            matches: true,
+          },
+        },
+      },
+    });
+
+    if (!existingTournament) {
+      return NextResponse.json(
+        { error: 'Tournament not found' },
+        { status: 404 }
+      );
+    }
+
+    // If user is SITE_ADMIN, verify they have access to this site
+    if (session.user.role === 'SITE_ADMIN' && existingTournament.siteId && session.user.siteId !== existingTournament.siteId) {
+      return NextResponse.json(
+        { error: 'Forbidden: You do not have access to this tournament' },
+        { status: 403 }
+      );
+    }
+
+    // Only allow deletion of DRAFT tournaments
+    if (existingTournament.status !== 'DRAFT') {
+      return NextResponse.json(
+        { error: 'Only tournaments in DRAFT status can be deleted. Consider cancelling instead.' },
+        { status: 400 }
+      );
+    }
+
+    // Delete the tournament (cascades to inscriptions and matches)
+    await db.tournament.delete({
+      where: { id },
+    });
+
+    return NextResponse.json({
+      message: 'Tournament deleted successfully',
+    });
+  } catch (error) {
+    console.error('Error deleting tournament:', error);
+    return NextResponse.json(
+      { error: 'Failed to delete tournament' },
+      { status: 500 }
+    );
+  }
+}
diff --git a/apps/web/app/api/tournaments/route.ts b/apps/web/app/api/tournaments/route.ts
new file mode 100644
index 0000000..f28cc42
--- /dev/null
+++ b/apps/web/app/api/tournaments/route.ts
@@ -0,0 +1,233 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getServerSession } from 'next-auth';
+import { authOptions } from '@/lib/auth';
+import { db } from '@/lib/db';
+import { z } from 'zod';
+import { Decimal } from '@prisma/client/runtime/library';
+
+// Validation schema for creating a tournament
+const createTournamentSchema = z.object({
+  siteId: z.string().cuid('Invalid site ID'),
+  name: z.string().min(1, 'Name is required').max(100),
+  description: z.string().max(500).optional(),
+  date: z.string().datetime({ message: 'Invalid date format' }),
+  endDate: z.string().datetime({ message: 'Invalid end date format' }).optional(),
+  type: z.enum(['SINGLE_ELIMINATION', 'DOUBLE_ELIMINATION', 'ROUND_ROBIN', 'LEAGUE']),
+  category: z.string().max(50).optional(),
+  maxTeams: z.number().int().min(2, 'Minimum 2 teams required'),
+  price: z.number().nonnegative('Price must be non-negative'),
+});
+
+// Map API types to database types
+function mapTournamentType(type: string): 'AMERICANO' | 'MEXICANO' | 'BRACKET' | 'ROUND_ROBIN' | 'LEAGUE' {
+  const mapping: Record<string, 'AMERICANO' | 'MEXICANO' | 'BRACKET' | 'ROUND_ROBIN' | 'LEAGUE'> = {
+    'SINGLE_ELIMINATION': 'BRACKET',
+    'DOUBLE_ELIMINATION': 'BRACKET',
+    'ROUND_ROBIN': 'ROUND_ROBIN',
+    'LEAGUE': 'LEAGUE',
+  };
+  return mapping[type] || 'BRACKET';
+}
+
+// GET /api/tournaments - List tournaments with filters
+export async function GET(request: NextRequest) {
+  try {
+    const session = await getServerSession(authOptions);
+
+    if (!session?.user) {
+      return NextResponse.json(
+        { error: 'Unauthorized' },
+        { status: 401 }
+      );
+    }
+
+    const { searchParams } = new URL(request.url);
+    const siteId = searchParams.get('siteId');
+    const status = searchParams.get('status');
+    const startDate = searchParams.get('startDate');
+    const endDate = searchParams.get('endDate');
+
+    // Build the where clause
+    interface TournamentWhereClause {
+      organizationId: string;
+      siteId?: string;
+      status?: 'DRAFT' | 'REGISTRATION_OPEN' | 'REGISTRATION_CLOSED' | 'IN_PROGRESS' | 'COMPLETED' | 'CANCELLED';
+      startDate?: {
+        gte?: Date;
+        lte?: Date;
+      };
+    }
+
+    const whereClause: TournamentWhereClause = {
+      organizationId: session.user.organizationId,
+    };
+
+    // Filter by site
+    if (siteId) {
+      whereClause.siteId = siteId;
+    } else if (session.user.siteId) {
+      whereClause.siteId = session.user.siteId;
+    }
+
+    // Filter by status
+    if (status) {
+      const validStatuses = ['DRAFT', 'REGISTRATION_OPEN', 'REGISTRATION_CLOSED', 'IN_PROGRESS', 'COMPLETED', 'CANCELLED'] as const;
+      const upperStatus = status.toUpperCase();
+      if (validStatuses.includes(upperStatus as typeof validStatuses[number])) {
+        whereClause.status = upperStatus as typeof validStatuses[number];
+      }
+    }
+
+    // Filter by date range
+    if (startDate || endDate) {
+      whereClause.startDate = {};
+
+      if (startDate) {
+        const start = new Date(startDate);
+        start.setHours(0, 0, 0, 0);
+        whereClause.startDate.gte = start;
+      }
+
+      if (endDate) {
+        const end = new Date(endDate);
+        end.setHours(23, 59, 59, 999);
+        whereClause.startDate.lte = end;
+      }
+    }
+
+    const tournaments = await db.tournament.findMany({
+      where: whereClause,
+      include: {
+        site: {
+          select: {
+            id: true,
+            name: true,
+            slug: true,
+          },
+        },
+        _count: {
+          select: {
+            inscriptions: true,
+            matches: true,
+          },
+        },
+      },
+      orderBy: {
+        startDate: 'desc',
+      },
+    });
+
+    return NextResponse.json(tournaments);
+  } catch (error) {
+    console.error('Error fetching tournaments:', error);
+    return NextResponse.json(
+      { error: 'Failed to fetch tournaments' },
+      { status: 500 }
+    );
+  }
+}
+
+// POST /api/tournaments - Create a new tournament
+export async function POST(request: NextRequest) {
+  try {
+    const session = await getServerSession(authOptions);
+
+    if (!session?.user) {
+      return NextResponse.json(
+        { error: 'Unauthorized' },
+        { status: 401 }
+      );
+    }
+
+    // Check if user has admin role
+    const allowedRoles = ['SUPER_ADMIN', 'ORG_ADMIN', 'SITE_ADMIN'];
+    if (!allowedRoles.includes(session.user.role)) {
+      return NextResponse.json(
+        { error: 'Forbidden: Insufficient permissions' },
+        { status: 403 }
+      );
+    }
+
+    const body = await request.json();
+
+    // Validate input with Zod schema
+    const validationResult = createTournamentSchema.safeParse(body);
+    if (!validationResult.success) {
+      return NextResponse.json(
+        {
+          error: 'Invalid tournament data',
+          details: validationResult.error.flatten().fieldErrors,
+        },
+        { status: 400 }
+      );
+    }
+
+    const { siteId, name, description, date, endDate, type, category, maxTeams, price } = validationResult.data;
+
+    // Verify site belongs to user's organization
+    const site = await db.site.findFirst({
+      where: {
+        id: siteId,
+        organizationId: session.user.organizationId,
+      },
+    });
+
+    if (!site) {
+      return NextResponse.json(
+        { error: 'Site not found or does not belong to your organization' },
+        { status: 404 }
+      );
+    }
+
+    // If user is SITE_ADMIN, verify they have access to this site
+    if (session.user.role === 'SITE_ADMIN' && session.user.siteId !== siteId) {
+      return NextResponse.json(
+        { error: 'Forbidden: You do not have access to this site' },
+        { status: 403 }
+      );
+    }
+
+    // Create tournament
+    const tournament = await db.tournament.create({
+      data: {
+        organizationId: session.user.organizationId,
+        siteId,
+        name,
+        description: description || null,
+        type: mapTournamentType(type),
+        status: 'DRAFT',
+        startDate: new Date(date),
+        endDate: endDate ? new Date(endDate) : null,
+        maxPlayers: maxTeams,
+        entryFee: new Decimal(price),
+        settings: {
+          tournamentFormat: type,
+          category: category || null,
+        },
+      },
+      include: {
+        site: {
+          select: {
+            id: true,
+            name: true,
+            slug: true,
+          },
+        },
+        _count: {
+          select: {
+            inscriptions: true,
+            matches: true,
+          },
+        },
+      },
+    });
+
+    return NextResponse.json(tournament, { status: 201 });
+  } catch (error) {
+    console.error('Error creating tournament:', error);
+    return NextResponse.json(
+      { error: 'Failed to create tournament' },
+      { status: 500 }
+    );
+  }
+}