St. Petersburg 2 challenger 2021
ChallengerHard indoorSaint Petersburg, Russia7 March – 14 March 2021Prize money: 52,080 USD43 matchesAltitude: 4 mCourt: Slow
Champion Evgenii Tiurnev · Final: 7-6(1) 7-5
Final rounds
| Final | Evgenii Tiurnev vs Kacper Zuk | 6-4 6-2 |
| Semifinal | Kacper Zuk vs Jiri Lehecka | 7-6(7) 6-3 |
| Semifinal | Evgenii Tiurnev vs Marius Copil | 7-6(4) 6-2 |
| Quarterfinal | Kacper Zuk vs Jack Sock | 6-3 6-2 |
| Quarterfinal | Evgenii Tiurnev vs Mirza Basic | 6-4 6-2 |
| Quarterfinal | Jiri Lehecka vs Dmitry Popko | 6-4 6-4 |
| Quarterfinal | Marius Copil vs Christopher Eubanks | 7-6(1) 7-5 |
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