2011 St. Petersburg Open – Singles

Mikhail Kukushkin was the defending champion but lost to Michael Berrer in the first round.

Marin Čilić won the tournament beating Janko Tipsarević in the final, 6–3, 3–6, 6–2.

Seeds
• # 🇫🇷 Gilles Simon (first round)

• # 🇷🇸 Janko Tipsarević (final)

• # 🇺🇦 Alexandr Dolgopolov (first round)

• # Marin Čilić (champion)

• # 🇷🇺 Mikhail Youzhny (semifinals)

• # 🇪🇸 Marcel Granollers (first round)

• # 🇺🇸 Alex Bogomolov Jr. (semifinals)

• # 🇷🇺 Dmitry Tursunov (second round)