BALI, Indonesia, Nov. 3 (UPI) -- Nadia Petrova and defending champion Ana Ivanovic posted upsets Thursday in quarterfinals of the WTA's Commonwealth Bank Tournament of Champions in Indonesia.
Petrova knocked off second-seeded Peng Shuai 6-4, 6-3 with seven breaks in 10 receiving games. Petrova won 56 percent of the points off Peng's serve.