Suzann Pettersen, ranked fourth in the world, and first-round leader Azahara Munoz were among those at 138.
Jiyai Shin, who moved into the top position in the world rankings with the retirement of Lorena Ochoa, was tied for 13th place at 140. Defending champion Angela Stanford was also at 140.
Pak has won 24 times on the LPGA Tour but has not had a victory in three years. Her best finish this season has been a tie for 15th at the Kraft Nabisco Championship last month.
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