The 2011 Mercury Insurance Open was a women's tennis tournament played on outdoor hard courts. It is the 2nd edition of the Southern California Open since the tournament left the tour in 2007. It is classified as one of the WTA Premier tournaments of the 2011 WTA Tour. It takes place in Carlsbad, California, United States. Agnieszka Radwańska won the singles title.
See main article: 2011 Mercury Insurance Open – Singles. 
Agnieszka Radwańska defeated 
Vera Zvonareva 6–3, 6–4.
See main article: 2011 Mercury Insurance Open – Doubles. 
Květa Peschke / Katarina Srebotnik defeated 
Raquel Kops-Jones / Abigail Spears 6–0, 6–2
| Nation | Player | Ranking* | Seed | |
|---|---|---|---|---|
| Russian Federation | Vera Zvonareva | 3 | 1 | |
| 11 | 2 | |||
| Poland | 14 | 3 | ||
 China | 16 | 4 | ||
 Serbia | Ana Ivanovic | 17 | 5 | |
 Slovakia | Dominika Cibulková | 19 | 6 | |
| Julia Görges | 20 | 7 | ||
| Slovakia | Daniela Hantuchová | 21 | 8 | |
 Italy | Roberta Vinci | 22 | 9 | |
| Italy | Flavia Pennetta | 23 | 10 | |
| Russian Federation | Maria Kirilenko | 25 | 11 | |
| Sabine Lisicki | 26 | 12 | ||
 Australia | Jarmila Gajdošová | 28 | 13 | |
| Russian Federation | Elena Vesnina | 33 | 14 | |
| Italy | Sara Errani | 36 | 15 | |
| 39 | 16 |
The following players received wildcards into the singles main draw
The following players received entry from the qualifying draw:
See main article: 2011 Mercury Insurance Open – Singles qualifying.
Gréta Arn Jill Craybas
Marina Erakovic
Rika Fujiwara
Marie-Ève Pelletier Zoë Gwen Scandalis Ashley WeinholdThe following player received entry as a lucky loser into the singles main draw:
