| Champ: |  Agnieszka Radwańska |
| Runner: |  Vera Zvonareva |
| Score: | 6–3, 6–2 |
| Type: | singles doubles |
| Draw: | 56 (8 / 3) |
| Seeds: | 16 |
| Before Name: | Toray Pan Pacific Open – Singles |
| After Name: | Toray Pan Pacific Open – Singles |
| Main Name: | Pan Pacific Open |
See main article: 2011 Toray Pan Pacific Open.
Agnieszka Radwańska defeated Vera Zvonareva in the final, 6 - 3, 6 - 2 to win the singles tennis title at the 2011 Pan Pacific Open.
Caroline Wozniacki was the defending champion, but lost to Kaia Kanepi in the third round.
The top eight seeds received a bye into the second round.
See main article: 2011 Toray Pan Pacific Open – Singles qualifying.