St. Petersburg Open · ATP
St. Petersburg Open 2021
ATP 250Hard indoorSt. Petersburg, Russia24 October – 31 October 2021Prize money: 932,370 USD39 matchesAltitude: 4 mCourt: Slow
Champion Marin Cilic · Final: 6-4 6-2
Final rounds
| Final | Marin Cilic vs Taylor Fritz | 7-6(3) 4-6 6-4 |
| Semifinal | Marin Cilic vs Botic Van De Zandschulp | 6-3 6-3 |
| Semifinal | Taylor Fritz vs Jan-Lennard Struff | 5-7 6-1 6-3 |
| Quarterfinal | Botic Van De Zandschulp vs Andrey Rublev | 6-3 6-4 |
| Quarterfinal | Marin Cilic vs Roberto Bautista-Agut | 6-4 3-6 6-3 |
| Quarterfinal | Jan-Lennard Struff vs Denis Shapovalov | 6-4 6-3 |
| Quarterfinal | Taylor Fritz vs John Millman | 6-4 6-2 |
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