Kremlin Cup · ATP
Kremlin Cup 2021
ATP 250Hard indoorMoscow, Russia16 October – 24 October 2021Prize money: 779,515 USD39 matchesAltitude: 151 mCourt: Medium-slow
Champion Aslan Karatsev · Final: 6-2 7-6(1)
Final rounds
| Final | Aslan Karatsev vs Marin Cilic | 6-2 6-4 |
| Semifinal | Aslan Karatsev vs Karen Khachanov | 7-6(7) 6-1 |
| Semifinal | Marin Cilic vs Ricardas Berankis | 6-3 6-4 |
| Quarterfinal | Aslan Karatsev vs Gilles Simon | 6-4 6-3 |
| Quarterfinal | Karen Khachanov vs John Millman | 7-5 7-6(4) |
| Quarterfinal | Marin Cilic vs Pedro Martinez | 6-1 6-2 |
| Quarterfinal | Ricardas Berankis vs Adrian Mannarino | 6-2 7-6(1) |
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