| Champ: |  Lindsay Davenport |
| Runner: | Magdalena Maleeva |
| Score: | 6–4, 6–1 |
| Type: | singles doubles |
| Draw: | 28 (4 / 3) |
| Seeds: | 8 |
| Before Name: | Toray Pan Pacific Open – Singles |
| After Name: | Toray Pan Pacific Open – Singles |
| Main Name: | Pan Pacific Open |
Defending champion Lindsay Davenport defeated Magdalena Maleeva in the final, 6–4, 6–1 to win the singles tennis title at the 2004 Pan Pacific Open. It was her first title of the season, and the 39th of her career.
The first four seeds received a bye into the second round.