Serena Williams of the United States celebrates a point won against Li Na of China in their Women's singles semifinal match at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 28, 2010. (AP Photo/Mark Baker)

Jelena Jankovic of Servia eyes on the ball for a return to Li Na of China during their semifinal match at the Pan Pacific Open tennis tournament in Tokyo, Friday, Oct. 2, 2009. (AP Photo/Shuji Kajiyama)

epa01876902 Alize Cornet of France hits a backhand against Na Li of China during their first round match at the Toray Pan Pacific Open Tennis Tournament, in Tokyo, Japan, 27 September 2009. EPA/FRANCK ROBICHON

Kim Clijsters (BEL) battles against Na Li (CHN)Mark Lyons PhotographyUS Open 2009Flushing Meadow New York Photo via Newscom