2021 St. Petersburg Open
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| 2021 St. Petersburg Open | |
|---|---|
| Date | October 25–31 |
| Edition | 26th |
| Category | ATP World Tour 250 Series |
| Draw | 32S / 16D |
| Prize money | $863,705 |
| Surface | Hard (indoor) |
| Location | St. Petersburg, Russia |
| Venue | Sibur Arena |
| Champions | |
| Singles | |
 Marin Čilić | |
| Doubles | |
 Jamie Murray /  Bruno Soares | |
The 2021 St. Petersburg Open was a tennis tournament played on indoor hard courts. It was the 26th edition of the St. Petersburg Open, and part of the ATP World Tour 250 Series of the 2021 ATP Tour. It took place at the Sibur Arena in Saint Petersburg, Russia, from October 25 through 31, 2021.[1]
Singles
Marin Čilić def. 
Taylor Fritz, 7–6(7–3), 4–6, 6–4
Doubles
Jamie Murray / Bruno Soares def. 
Andrey Golubev / 
Hugo Nys, 6–3, 6–4
Singles main-draw entrants
Seeds
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 RUS |
Andrey Rublev | 6 | 1 |
 CAN |
Denis Shapovalov | 14 | 2 |
 ESP |
Roberto Bautista Agut | 20 | 3 |
| RUS |
Aslan Karatsev | 22 | 4 |
| USA |
Taylor Fritz | 30 | 5 |
| RUS |
Karen Khachanov | 31 | 6 |
| KAZ |
Alexander Bublik | 35 | 7 |
| USA |
Sebastian Korda | 38 | 8 |
- Rankings are as of 18 October 2021
Other entrants
The following players received wildcards into the singles main draw:
The following player received entry using a protected ranking:
The following players received entry from the qualifying draw:
