Maria Sharapova from Russia returns the ball to Christina McHale from US during a Madrid Open tennis tournament match, in Madrid, Spain, Tuesday May 6, 2014. (AP Photo/Andres Kudacki)
Maria Sharapova from Russia returns the ball during a Madrid Open tennis tournament match against Christina McHale from US, in Madrid, Spain, Tuesday, May 6, 2014. (AP Photo/Andres Kudacki)
Li Na from China serves during a Madrid Open tennis tournament match against Jie Zheng from China, in Madrid, Spain, Tuesday, May 6, 2014. (AP Photo/Andres Kudacki)
Jie Zheng from China serves during a Madrid Open tennis tournament match against Na Li from China, in Madrid, Spain, Tuesday May 6, 2014. (AP Photo/Andres Kudacki)
Li Na from China returns the ball during a Madrid Open tennis tournament match against Jie Zheng from China, in Madrid, Spain, Tuesday, May 6, 2014. (AP Photo/Andres Kudacki)
Li Na from China returns the ball during a Madrid Open tennis tournament match against Jie Zheng from China, in Madrid, Spain, Tuesday, May 6, 2014. (AP Photo/Andres Kudacki)