2020 St. Petersburg Open

The 2020 St. Petersburg Open is a tennis tournament played on indoor hard courts that is part of the 2020 ATP Tour. It is the 25th edition of the St. Petersburg Open. The tournament was originally scheduled to take place from September 21 to 27, 2020, but was moved to October 12–18, and, since the ongoing COVID-19 pandemic caused many tournaments to be cancelled, upgraded to ATP 500 level for this one year. It is taking place at the Sibur Arena in Saint Petersburg, Russia.

Seeds

 * 1 Rankings are as of September 28, 2020

Other entrants
The following players received wildcards into the singles main draw:
 * 🇷🇺 Evgeny Donskoy
 * 🇷🇺 Aslan Karatsev
 * 🇷🇺 Roman Safiullin

The following player received entry using a protected ranking into the singles main draw:
 * 🇺🇸 Mackenzie McDonald

The following players received entry from the qualifying draw:
 * 🇧🇾 Ilya Ivashka
 * 🇷🇺 Pavel Kotov
 * Nino Serdarušić
 * 🇺🇸 J. J. Wolf

The following players received entry as a lucky loser:
 * 🇪🇨 Emilio Gómez
 * 🇷🇸 Viktor Troicki

Withdrawals

 * Before the tournament
 * Kevin Anderson → replaced by 🇰🇿 Alexander Bublik
 * 🇮🇹 Matteo Berrettini → replaced by 🇰🇿 Mikhail Kukushkin
 * 🇪🇸 Pablo Carreño Busta → replaced by 🇪🇸 Feliciano López
 * 🇧🇬 Grigor Dimitrov → replaced by 🇬🇧 Cameron Norrie
 * 🇧🇪 David Goffin → replaced by 🇪🇨 Emilio Gómez
 * 🇯🇵 Kei Nishikori → replaced by 🇨🇦 Vasek Pospisil
 * 🇺🇸 Sam Querrey → replaced by 🇷🇸 Viktor Troicki
 * Stefanos Tsitsipas → replaced by 🇧🇾 Egor Gerasimov

Seeds

 * Rankings are as of September 20, 2020

Other entrants
The following pairs received wildcards into the doubles main draw:
 * 🇮🇱 Jonathan Erlich / 🇧🇾 Andrei Vasilevski
 * 🇷🇺 Daniil Golubev / 🇷🇺 Evgenii Tiurnev

The following pair received entry from the qualifying draw:
 * 🇷🇺 Evgeny Donskoy / 🇷🇺 Roman Safiullin

The following pair received entry as lucky losers:
 * 🇦🇺 James Duckworth / 🇧🇾 Ilya Ivashka

Withdrawals

 * Before the tournament
 * 🇺🇸 Sam Querrey
 * During the tournament
 * 🇦🇺 James Duckworth

Singles

 * 🇷🇺 Andrey Rublev def. Borna Ćorić, 7–6(7–5), 6–4

Doubles

 * 🇦🇹 Jürgen Melzer / 🇫🇷 Édouard Roger-Vasselin def. 🇧🇷 Marcelo Demoliner / Matwé Middelkoop, 6–2, 7–6(7–4)