Top seed Vera Zvonareva was forced to retire from the WTA Pattaya Open tennis tournament in Thailand with a left hip injury.
The Russian, who won the title in 2009 and 2010, quit her quarter-final against seventh-seeded Romanian Sorana Cirstea after winning the first set 6-2, losing the second set 6-4 and at 2-2 in the third.
Defending champion and third-seeded Slovak Daniela Hantuchova won a high-quality battle against American eighth seed Vania King, advancing 7-6 (9-7) 6-4.
Fourth-seeded Russian Maria Kirilenko beat Thailand's Tamarine Tanasugarn 7-6 (7-2) 6-1 and Taiwanese qualifier Hsieh Su-Wei reached her first WTA Tour semi-final in more than 10 years as she defeated India's Sania Mirza 7-5, 6-3.
Zvonareva will now travel to her next event in Doha, but is still unsure whether she will be able to play.
