In the final tournament prior to next week's U.S. Open, the eighth-seeded Mauresmo surprised top-seeded Svetlana Kuznetsova 7-6 (11-9), 2-6, 6-3.
Kuznetsova is the reigning French Open champion and a former U.S. Open winner.
No. 2 seed Caroline Wozniacki coasted into the semifinals with a 6-4, 6-3 win over Virginie Razzano in a match that took 81 minutes. Wozniacki is seeking her second straight Pilot Pen title.
Wozniacki will face third-seeded Flavia Pennetta in the semifinals after Pennetta disposed of Magdalena Rybarikova 6-2, 6-2.
Pennetta is 18-2 in her last 20 matches, including tournament titles in Palermo and Los Angeles.
Elena Vesnina defeated Anna Chakvetadze 6-1, 7-5 to set up a semifinal meeting with Pennetta.
Copyright 2009 by United Press International.
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