Li has not dropped a set, not even been pushed to a tie breaker, on her way back to the semifinals here, where she and her compatriot Zheng Jie were beaten last year.

半决赛前，李娜未失一盘，甚至没有被拖入过决胜局，去年她和她的同胞郑洁半决赛双双失利。

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Today Principal Li wore a yellow tie.

李校长今天戴了一条黄色的领带。

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Professor li tie proposes the "Balance Treatment" to against tumor, the point is to raise the quality of patients' life.

李铁教授提出对于肿瘤患者治疗的“平衡疗法”，着重提高患者的生存质量。

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Russian No. 2 Sharapova will play 20th-seeded compatriot Maria Kirilenko, while the remaining quarterfinal tie pits China's French Open champion Li Na against German No. 18 Angelique Kerber.

CNN: STORY HIGHLIGHTS

Petrova won her first-round tie against compatriot Elena Vesnina, triumphing 4-6 6-2 6-3, while Chinese 13th seed Li Na beat Spain's Beatriz Garcia Vidagany 6-0 6-2 to set up a clash with Slovakia's Dominika Cibulkova.

CNN: Serena survives epic in Madrid opener