diff --git a/src/app/components/tournament-manage/tournament-manage.component.html b/src/app/components/tournament-manage/tournament-manage.component.html
index 603c8ec..d7cef49 100644
--- a/src/app/components/tournament-manage/tournament-manage.component.html
+++ b/src/app/components/tournament-manage/tournament-manage.component.html
@@ -323,10 +323,19 @@
                                     </td>
                                     <td class="align-middle w-fill">
                                       @if (match.status == 'NOT_STARTED') {
-                                        <button mat-button (click)="startMatch(match)">
-                                          <mat-icon>play_arrow</mat-icon>
-                                          Wedstrijd starten
-                                        </button>
+                                        @if (match.canStart) {
+                                          <button mat-button (click)="startMatch(match)">
+                                            <mat-icon>play_arrow</mat-icon>
+                                            Wedstrijd starten
+                                          </button>
+                                        } @else {
+                                          <span [matTooltip]="match.cantStartReason" style="cursor: not-allowed;">
+                                            <button mat-button disabled>
+                                              <mat-icon>play_arrow</mat-icon>
+                                              Wedstrijd starten
+                                            </button>
+                                          </span>
+                                        }
                                       } @else if (match.status == 'IN_PROGRESS') {
                                         <button mat-button (click)="editResult(match, event, group, round)">
                                           <mat-icon>leaderboard</mat-icon>
diff --git a/src/app/components/tournament-manage/tournament-manage.component.ts b/src/app/components/tournament-manage/tournament-manage.component.ts
index dee95b2..889ef90 100644
--- a/src/app/components/tournament-manage/tournament-manage.component.ts
+++ b/src/app/components/tournament-manage/tournament-manage.component.ts
@@ -33,9 +33,10 @@ import {Standings} from "../../model/standings";
 import {HeaderService} from "../../service/header.service";
 import {TournamentPlayersComponent} from "../tournament-players/tournament-players.component";
 import {TournamentPlayer} from "../../model/tournamentPlayer";
-import {MatTooltip} from "@angular/material/tooltip";
 import {TeamDisplayComponent} from "../team-display/team-display.component";
 import {CounterSelectionComponent} from "../counter-selection/counter-selection.component";
+import {Observable, Subscription, tap} from "rxjs";
+import {MatTooltip} from '@angular/material/tooltip';
 
 @Component({
   selector: 'app-tournament-manage',
@@ -66,6 +67,7 @@ import {CounterSelectionComponent} from "../counter-selection/counter-selection.
     TournamentPlayersComponent,
     MatExpansionPanelActionRow,
     TeamDisplayComponent,
+    MatTooltip,
   ],
   providers: [
     FullNamePipe,
@@ -98,10 +100,10 @@ export class TournamentManageComponent implements OnInit, OnDestroy {
         this.activeRoundTab = params['tab'];
       }
     })
-    this.tournamentService.getById(Number(id)).subscribe(data => {
-      this.tournament = data;
-      this.headerService.setTitle(this.tournament.name);
-    });
+    this.loadTournament(
+      this.tournamentService.getById(Number(id)),
+      (tournament) => this.headerService.setTitle(tournament.name)
+    );
   }
 
   ngOnDestroy() {
@@ -152,45 +154,31 @@ export class TournamentManageComponent implements OnInit, OnDestroy {
   }
 
   startRound(round: Round) {
-    this.tournamentService.startRound(this.tournament.id, round.id).subscribe(data => {
-      this.tournament = data;
-    });
+    this.loadTournament(this.tournamentService.startRound(this.tournament.id, round.id));
   }
 
   finishRound(round: Round) {
-    this.tournamentService.finishRound(this.tournament.id, round.id).subscribe(data => {
-      this.tournament = data;
-    });
+    this.loadTournament(this.tournamentService.finishRound(this.tournament.id, round.id));
   }
 
   finishGroup(group: Group) {
-    this.tournamentService.finishGroup(this.tournament.id, group.id).subscribe(data => {
-      this.tournament = data;
-    });
+    this.loadTournament(this.tournamentService.finishGroup(this.tournament.id, group.id));
   }
 
   reopenGroup(group: Group) {
-    this.tournamentService.reopenGroup(this.tournament.id, group.id).subscribe(data => {
-      this.tournament = data;
-    });
+    this.loadTournament(this.tournamentService.reopenGroup(this.tournament.id, group.id));
   }
 
   divideTournament() {
-    this.tournamentService.divide(this.tournament.id).subscribe(data => {
-      this.tournament = data;
-    });
+    this.loadTournament(this.tournamentService.divide(this.tournament.id));
   }
 
   clearDivision() {
-    this.tournamentService.clearDivision(this.tournament.id).subscribe(data => {
-      this.tournament = data;
-    });
+    this.loadTournament(this.tournamentService.clearDivision(this.tournament.id));
   }
 
   drawTournament() {
-    this.tournamentService.draw(this.tournament.id).subscribe(data => {
-      this.tournament = data;
-    });
+    this.loadTournament(this.tournamentService.draw(this.tournament.id));
   }
 
   startMatch(match: Match) {
@@ -214,9 +202,7 @@ export class TournamentManageComponent implements OnInit, OnDestroy {
         minHeight: '250px'
       }).afterClosed().subscribe(result => {
         if (result != undefined) {
-          this.tournamentService.startMatch(this.tournament.id, match.id, result.court, result.counter.playerId).subscribe(data => {
-            this.tournament = data;
-          });
+          this.loadTournament(this.tournamentService.startMatch(this.tournament.id, match.id, result.court, result.counter.playerId));
         }
       });
     }
@@ -233,6 +219,16 @@ export class TournamentManageComponent implements OnInit, OnDestroy {
     return matchPlayersThatArePlaying.length > 0;
   }
 
+  matchPlayersThatArePlaying(match: Match): number[] {
+    let matchPlayers: number[] = [];
+    matchPlayers.push(this.getTournamentPlayerFromPlayer(match.team1.player1).id);
+    if (match.team1.player2) matchPlayers.push(this.getTournamentPlayerFromPlayer(match.team1.player2).id);
+    matchPlayers.push(this.getTournamentPlayerFromPlayer(match.team2.player1).id);
+    if (match.team2.player2) matchPlayers.push(this.getTournamentPlayerFromPlayer(match.team2.player2).id);
+
+    return this.tournament.playersPlaying.filter(Set.prototype.has, new Set(matchPlayers));
+  }
+
   matchContainsPlayersThatAreCounting(match: Match): boolean {
     let matchPlayers: number[] = [];
     matchPlayers.push(this.getTournamentPlayerFromPlayer(match.team1.player1).id);
@@ -244,6 +240,16 @@ export class TournamentManageComponent implements OnInit, OnDestroy {
     return matchPlayersThatAreCounting.length > 0;
   }
 
+  matchPlayersThatAreCounting(match: Match): number[] {
+    let matchPlayers: number[] = [];
+    matchPlayers.push(this.getTournamentPlayerFromPlayer(match.team1.player1).id);
+    if (match.team1.player2) matchPlayers.push(this.getTournamentPlayerFromPlayer(match.team1.player2).id);
+    matchPlayers.push(this.getTournamentPlayerFromPlayer(match.team2.player1).id);
+    if (match.team2.player2) matchPlayers.push(this.getTournamentPlayerFromPlayer(match.team2.player2).id);
+
+    return this.tournament.playersCounting.filter(Set.prototype.has, new Set(matchPlayers));
+  }
+
   getTournamentPlayerFromPlayer(player: Player): TournamentPlayer {
     for (let tournamentPlayer of this.tournament.tournamentPlayers) {
       if (tournamentPlayer.playerId == player.id) {
@@ -303,15 +309,11 @@ export class TournamentManageComponent implements OnInit, OnDestroy {
   }
 
   stopMatch(match: Match) {
-    this.tournamentService.stopMatch(this.tournament.id, match.id).subscribe(data => {
-      this.tournament = data;
-    })
+    this.loadTournament(this.tournamentService.stopMatch(this.tournament.id, match.id));
   }
 
   newRound(group: Group) {
-    this.tournamentService.newRound(this.tournament.id, group.id).subscribe(data => {
-      this.tournament = data;
-    })
+    this.loadTournament(this.tournamentService.newRound(this.tournament.id, group.id));
   }
 
   getStrength(strength: string | undefined) {
@@ -376,9 +378,7 @@ export class TournamentManageComponent implements OnInit, OnDestroy {
       minWidth: '800px'
     }).afterClosed().subscribe(result => {
       if (result != undefined) {
-        this.tournamentService.saveResult(this.tournament.id, result.matchId, result).subscribe(data => {
-          this.tournament = data;
-        })
+        this.loadTournament(this.tournamentService.saveResult(this.tournament.id, result.matchId, result));
       }
     });
   }
@@ -439,13 +439,74 @@ export class TournamentManageComponent implements OnInit, OnDestroy {
       minHeight: '250px'
     }).afterClosed().subscribe(result => {
       if (result != undefined) {
-        this.tournamentService.updateCounter(this.tournament.id, match.id, result.counter.playerId).subscribe(data => {
-          this.tournament = data;
-        });
+        this.loadTournament(this.tournamentService.updateCounter(this.tournament.id, match.id, result.counter.playerId));
       }
     });
 
   }
+
+  private loadTournament(
+    observable: Observable<Tournament>,
+    afterLoad?: (tournament: Tournament) => void
+  ): Subscription {
+    return observable.subscribe(data => {
+      this.tournament = data;
+      this.updateMatchAvailability();
+      afterLoad?.(data);  // Optional chaining
+    });
+  }
+
+  private updateMatchAvailability() {
+    for (const event of this.tournament.events) {
+      for (const group of event.groups) {
+        for (const round of group.rounds) {
+          for (const match of round.matches) {
+            let canStart = true;
+            let matchPlayersThatArePlaying = this.matchPlayersThatArePlaying(match);
+            let matchPlayersThatAreCounting = this.matchPlayersThatAreCounting(match);
+
+            let cantStartReason = "";
+
+            if (matchPlayersThatArePlaying.length > 0) {
+              canStart = false;
+              cantStartReason = this.joinWithEn(matchPlayersThatArePlaying.map(m => this.getTournamentPlayerFromId(m).name));
+              if (matchPlayersThatArePlaying.length == 1) {
+                cantStartReason += " is al aan het spelen";
+              } else {
+                cantStartReason += " zijn al aan het spelen";
+              }
+            }
+
+            if (matchPlayersThatAreCounting.length > 0) {
+              canStart = false;
+              if (cantStartReason.length > 0) {
+                cantStartReason += " en ";
+              }
+              cantStartReason += this.joinWithEn(matchPlayersThatAreCounting.map(m => this.getTournamentPlayerFromId(m).name));
+              if (matchPlayersThatAreCounting.length == 1) {
+                cantStartReason += " is aan het tellen";
+              } else {
+                cantStartReason += " zijn aan het tellen";
+              }
+            }
+
+            match.canStart = canStart;
+            match.cantStartReason = cantStartReason;
+          }
+        }
+      }
+    }
+  }
+
+  joinWithEn(items: string[], separator = ", "): string {
+    const len = items.length;
+
+    if (len === 0) return "";
+    if (len === 1) return items[0];
+    if (len === 2) return items.join(" en ");
+
+    return items.slice(0, -1).join(separator) + `${separator}and ${items[len - 1]}`;
+  }
 }
 
 class ActiveMatch {
diff --git a/src/app/model/match.ts b/src/app/model/match.ts
index 88660fe..0a2cf5c 100644
--- a/src/app/model/match.ts
+++ b/src/app/model/match.ts
@@ -13,4 +13,6 @@ export class Match {
   games: Game[];
   court: number;
   counter: Player;
+  canStart?: boolean;
+  cantStartReason?: string;
 }
diff --git a/src/styles.css b/src/styles.css
index f53bfb2..7a49c27 100644
--- a/src/styles.css
+++ b/src/styles.css
@@ -7,3 +7,6 @@ body { margin: 0; font-family: Roboto, "Helvetica Neue", sans-serif; }
   z-index: 2000 !important;
 }
 */
+.mat-tooltip {
+  white-space: pre-line !important;
+}