2011 Bank of the West Classic – Singles

Victoria Azarenka was the defending champion, but lost to qualifier Marina Erakovic in the second round.

Serena Williams, ranked world no. 169 at the time, won the title by defeating Marion Bartoli 7–5, 6–1 in the final. This win was Williams' first WTA title since her win in Wimbledon on July 3, 2010, it was on her third tournament of the year following injuries and health problems sustained with the 2010 season.

Seeds
The top four seeds received a bye into the second round. • # 🇧🇾 Victoria Azarenka (second round)

• # 🇷🇺 Maria Sharapova (quarterfinals)

• # 🇫🇷 Marion Bartoli (final)

• # 🇦🇺 Samantha Stosur (second round)

• # 🇵🇱 Agnieszka Radwańska (quarterfinals)

• # 🇩🇪 Julia Görges (first round)

• # 🇷🇸 Ana Ivanovic (first round)

• # 🇸🇰 Dominika Cibulková (semifinals, withdrew due to an abdominal injury)