Jarkko Nieminen from Finland returns the ball during a Madrid Open tennis tournament match against Rafael Nadal from Spain, in Madrid, Spain, Thursday, May 8, 2014. (AP Photo/Daniel Ochoa de Olza)
Rafael Nadal from Spain celebrates a point during a Madrid Open tennis tournament match against Tomas Berdych from Czech Republic in Madrid, Spain, Friday, May 9, 2014. (AP Photo/Andres Kudacki)
Rafael Nadal from Spain celebrates a point during a Madrid Open tennis tournament match against Jarkko Nieminen, from Finland, in Madrid, Spain, Thursday, May 8, 2014 . (AP Photo/Daniel Ochoa de Olza)
Maria Sharapova from Russia returns the ball during a Madrid Open tennis tournament match against Li Na from China in Madrid, Spain, Friday, May 9, 2014. (AP Photo/Daniel Ochoa de Olza)
Li Na from China returns the ball during a Madrid Open tennis tournament match against Maria Sharapova from Russia in Madrid, Spain, Friday, May 9, 2014 . (AP Photo/Daniel Ochoa de Olza)
Maria Sharapova from Russia serves the ball during a Madrid Open tennis tournament match against Li Na from China in Madrid, Spain, Friday, May 9, 2014. (AP Photo/Daniel Ochoa de Olza)
Maria Sharapova from Russia serves the ball during a Madrid Open tennis tournament match against Li Na from China in Madrid, Spain, Friday, May 9, 2014 . (AP Photo/Daniel Ochoa de Olza)
Rafael Nadal from Spain returns the ball during a Madrid Open tennis tournament match against Jarkko Nieminen, from Finland, in Madrid, Spain, Thursday, May 8, 2014. (AP Photo/Daniel Ochoa de Olza)