2021 St. Petersburg Open
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.
Champions
Singles
Marin Čilić def. Taylor Fritz, 7–6, 4–6, 6–4Doubles
Jamie Murray / Bruno Soares def. Andrey Golubev / Hugo Nys, 6–3, 6–4Singles main-draw entrants
Seeds
- 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:
Doubles main-draw entrants
Seeds
- Rankings are as of October 18, 2021