St. Petersburg Ladies' Trophy 2021
WTA 500Hard indoorSt. Petersburg, Russia13 March – 21 March 2021Prize money: 565,530 USD45 matchesAltitude: 4 mCourt: Fast
Champion Darya Kasatkina · Final: 6-2 7-5
Final rounds
| Final | Darya Kasatkina vs Margarita Betova | 6-3 2-1 ret. |
| Semifinal | Darya Kasatkina vs Svetlana Kuznetsova | 1-6 6-0 6-2 |
| Semifinal | Margarita Betova vs Vera Zvonareva | 6-3 7-6(9) |
| Quarterfinal | Darya Kasatkina vs Veronika Kudermetova | 1-6 6-1 6-2 |
| Quarterfinal | Svetlana Kuznetsova vs Jaqueline Cristian | 6-7(5) 6-3 6-3 |
| Quarterfinal | Vera Zvonareva vs Anastasia Gasanova | 6-3 6-1 |
| Quarterfinal | Margarita Betova vs Ekaterina Alexandrova | 6-2 7-5 |
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