Japan's Ai Sugiyama recovered from a set down to shock second seed Svetlana Kuznetsova 2-6 6-4 6-3 at the Acura Classic in San Diego. Sugiyama, who faces Sesil Karatantcheva in the quarters, kept the pressure on Kuznetsova and the 2004 US Open winner came up with a string of mistakes.

Sania Mirza defeated on Petrova at WTA San Diego.Indian qualifier Sania provided the major upset of the day at the WTA stop in San Diego, using her power-baseline game to belt Russian No. 4 seed Nadia Petrova 6-2, 6-1 and advance into the third round.
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"She's a very good young player, very powerful, has great groundstrokes," said Petrova, who played with a taped right arm, suffering from an elbow strain. "The most difficult thing was that I hadn't really played a match in three weeks, and I had to play someone so powerful...My arm is getting better and hopefully, I'll get more practice matches in, get in better shape and be ready for Los Angeles." Mirza's plan was to come out swinging."I knew if I relaxed for a second she would have jumped on me," Mirza said. "I had a game plan in my mind and I'm glad I was able to do what I needed to.

Japan's Akiko Morigami defeated No.15 seed Flavia Pennetta 6-1 7-5 Morigami, who recently reached her first Tour final in Cincinnati. Another girl from Japan Ai Sugiyama advanced to the second round when opponent Meghann Shaughnessy retired early in the first set due to a lower back strain. Sania mirza of India defeated No.4 seed Nadia Petrova 6-2 6-1