St. Petersburg challenger 2021
ChallengerHard indoorSaint Petersburg, Russia28 February – 7 March 2021Prize money: 36,680 USD43 matchesAltitude: 4 mCourt: Slow
Champion Zizou Bergs · Final: 6-3 6-7(8) 6-3
Final rounds
| Final | Zizou Bergs vs Altug Celikbilek | 6-4 3-6 6-4 |
| Semifinal | Zizou Bergs vs Vit Kopriva | 7-6(7) 6-2 |
| Semifinal | Altug Celikbilek vs Artem Dubrivnyy | 5-7 6-2 6-3 |
| Quarterfinal | Zizou Bergs vs Lucas Catarina | 6-3 6-4 |
| Quarterfinal | Vit Kopriva vs Cem Ilkel | 7-5 6-2 |
| Quarterfinal | Altug Celikbilek vs Jesper De Jong | 7-6(7) 6-0 |
| Quarterfinal | Artem Dubrivnyy vs Andrey Kuznetsov | 6-3 6-7(8) 6-3 |
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