diff --git a/backend/controllers/tournamentController.js b/backend/controllers/tournamentController.js
index 4bfb580..a517233 100644
--- a/backend/controllers/tournamentController.js
+++ b/backend/controllers/tournamentController.js
@@ -420,6 +420,19 @@ export const resetMatches = async (req, res) => {
     }
 };
 
+export const cleanupOrphanedMatches = async (req, res) => {
+    const { authcode: token } = req.headers;
+    const { clubId, tournamentId } = req.body;
+    try {
+        const result = await tournamentService.cleanupOrphanedMatches(token, clubId, tournamentId);
+        emitTournamentChanged(clubId, tournamentId);
+        res.status(200).json(result);
+    } catch (err) {
+        console.error(err);
+        res.status(500).json({ error: err.message });
+    }
+};
+
 export const removeParticipant = async (req, res) => {
     const { authcode: token } = req.headers;
     const { clubId, tournamentId, participantId } = req.body;
diff --git a/backend/routes/tournamentRoutes.js b/backend/routes/tournamentRoutes.js
index 3afdd37..31eb2c8 100644
--- a/backend/routes/tournamentRoutes.js
+++ b/backend/routes/tournamentRoutes.js
@@ -19,6 +19,7 @@ import {
   manualAssignGroups,
   resetGroups,
   resetMatches,
+  cleanupOrphanedMatches,
   removeParticipant,
   updateParticipantSeeded,
   setParticipantGaveUp,
@@ -61,6 +62,7 @@ router.put('/participant/:clubId/:tournamentId/:participantId/gave-up', authenti
 router.post('/modus', authenticate, setModus);
 router.post('/groups/reset', authenticate, resetGroups);
 router.post('/matches/reset', authenticate, resetMatches);
+router.post('/matches/cleanup-orphaned', authenticate, cleanupOrphanedMatches);
 router.put('/groups', authenticate, createGroups);
 router.post('/groups/create', authenticate, createGroupsPerClass);
 router.post('/groups', authenticate, fillGroups);
diff --git a/backend/services/tournamentService.js b/backend/services/tournamentService.js
index a44dea3..2822efd 100644
--- a/backend/services/tournamentService.js
+++ b/backend/services/tournamentService.js
@@ -3201,6 +3201,38 @@ Ve    // 2. Neues Turnier anlegen
         await TournamentMatch.destroy({ where });
     }
 
+    /**
+     * Entfernt Matches, bei denen mindestens ein Spieler nicht mehr existiert
+     * (z.B. gelöscht bevor die Aufräum-Logik beim Teilnehmerlöschen eingeführt wurde).
+     */
+    async cleanupOrphanedMatches(userToken, clubId, tournamentId) {
+        await checkAccess(userToken, clubId);
+        const tournament = await Tournament.findByPk(tournamentId);
+        if (!tournament || tournament.clubId != clubId) {
+            throw new Error('Turnier nicht gefunden');
+        }
+
+        const members = await TournamentMember.findAll({ where: { tournamentId }, attributes: ['id'] });
+        const externals = await ExternalTournamentParticipant.findAll({ where: { tournamentId }, attributes: ['id'] });
+        const validIds = new Set([
+            ...members.map(m => m.id),
+            ...externals.map(e => e.id)
+        ]);
+
+        const matches = await TournamentMatch.findAll({ where: { tournamentId } });
+        let deletedCount = 0;
+        for (const m of matches) {
+            const p1Exists = !m.player1Id || validIds.has(m.player1Id);
+            const p2Exists = !m.player2Id || validIds.has(m.player2Id);
+            if (!p1Exists || !p2Exists) {
+                await TournamentResult.destroy({ where: { matchId: m.id } });
+                await m.destroy();
+                deletedCount++;
+            }
+        }
+        return { deletedCount };
+    }
+
     async removeParticipant(userToken, clubId, tournamentId, participantId) {
         await checkAccess(userToken, clubId);
         
diff --git a/frontend/src/components/tournament/TournamentGroupsTab.vue b/frontend/src/components/tournament/TournamentGroupsTab.vue
index 72042d5..83062d4 100644
--- a/frontend/src/components/tournament/TournamentGroupsTab.vue
+++ b/frontend/src/components/tournament/TournamentGroupsTab.vue
@@ -162,8 +162,14 @@
                 <button @click="$emit('create-matches')" class="btn-primary">
                     ▶️ Gruppenspiele berechnen
                 </button>
+                <button @click="$emit('cleanup-orphaned-matches')" class="btn-secondary">
+                    🧹 {{ $t('tournaments.cleanupOrphanedMatches') }}
+                </button>
             </div>
             <div v-if="filteredGroupMatches.length > 0" class="reset-controls" style="margin-top:1rem">
+                <button @click="$emit('cleanup-orphaned-matches')" class="btn-secondary">
+                    🧹 {{ $t('tournaments.cleanupOrphanedMatches') }}
+                </button>
                 <button @click="$emit('reset-matches')" class="trash-btn">
                     🗑️ {{ $t('tournaments.resetGroupMatches') }}
                 </button>
@@ -246,6 +252,7 @@ export default {
         'randomize-groups',
         'reset-groups',
         'reset-matches',
+        'cleanup-orphaned-matches',
         'create-matches',
         'highlight-match',
         'go-to-match',
diff --git a/frontend/src/i18n/locales/de.json b/frontend/src/i18n/locales/de.json
index 132bee4..ddb2151 100644
--- a/frontend/src/i18n/locales/de.json
+++ b/frontend/src/i18n/locales/de.json
@@ -648,6 +648,7 @@
     "errorMoreSeededThanUnseeded": "Es gibt mehr gesetzte als nicht gesetzte Spieler. Zufällige Paarungen können nicht erstellt werden.",
     "randomPairingsCreated": "Zufällige Paarungen wurden erstellt.",
     "resetGroupMatches": "Gruppenspiele",
+    "cleanupOrphanedMatches": "Verwaiste Spiele aufräumen",
     "groupMatches": "Gruppenspiele",
     "round": "Runde",
     "encounter": "Begegnung",
diff --git a/frontend/src/views/TournamentTab.vue b/frontend/src/views/TournamentTab.vue
index 563b8d9..ad3da0b 100644
--- a/frontend/src/views/TournamentTab.vue
+++ b/frontend/src/views/TournamentTab.vue
@@ -198,6 +198,7 @@
                 @randomize-groups="randomizeGroups()"
                 @reset-groups="resetGroups()"
                 @reset-matches="resetMatches()"
+                @cleanup-orphaned-matches="cleanupOrphanedMatches()"
                 @create-matches="createMatches()"
                 @highlight-match="highlightMatch"
                 @go-to-match="goToMatch"
@@ -2084,6 +2085,26 @@ export default {
             await this.loadTournamentData();
         },
 
+        async cleanupOrphanedMatches() {
+            try {
+                const res = await apiClient.post('/tournament/matches/cleanup-orphaned', {
+                    clubId: this.currentClub,
+                    tournamentId: this.selectedDate
+                });
+                const count = res.data?.deletedCount ?? 0;
+                await this.loadTournamentData();
+                if (count > 0) {
+                    await this.showInfo(this.$t('messages.success'), `${count} ${count === 1 ? 'Spiel' : 'Spiele'} entfernt.`, '');
+                } else {
+                    await this.showInfo(this.$t('messages.info'), 'Keine verwaisten Spiele gefunden.', '');
+                }
+            } catch (error) {
+                console.error('Fehler beim Aufräumen:', error);
+                const message = safeErrorMessage(error, 'Fehler beim Aufräumen verwaister Spiele.');
+                await this.showInfo(this.$t('messages.error'), message, '', 'error');
+            }
+        },
+
         async removeParticipant(p) {
             try {
                 if (this.allowsExternal && p.isExternal) {