Mika Miyazato started the day with the lead at 5-under, but a 5-over for Round 3 brought her back to even-par for the start of the fourth round. She is one better than Ai Miyazato who shot 5-over to move back to 1-over. It is very tight at the top of the leaderboard, though both Miyazato's are still in contention.
Cristie Kerr, So Yeon Ryu and Angela Stanford are each at 1-under for the lead in the final round. Kerr and Ryu each shot 2-under in Round 3. Kerr made three birdies and two bogeys over the final five holes to go to the top of the leaderboard. Ryu made three birdies on the back nine to move into a tie for the lead.
Paula Creamer was at even-par to begin Round 3, but three bogeys and one birdie left her at 2-over for the tournament. Yani Tseng will not reach the career grand slam as she is at 4-over for the tournament.
The top 10 leaderboard:
| Pos | Player | Score |
| T1 | So Yeon Ryu | -1 |
| T1 | Cristie Kerr | -1 |
| T1 | Angela Stanford | -1 |
| T4 | Hee Kyung Seo | E |
| T4 | Mika Miyazato | E |
| T6 | Ai Miyazato | +1 |
| T6 | Inbee Park | +1 |
| T8 | Karrie Webb | +2 |
| T8 | Lizette Salas | +2 |
| T8 | Paula Creamer | +2 |
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