Madrid Open

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Kei Nishikori from Japan returns the ball during a Madrid Open tennis tournament final match against Rafael Nadal from Spain in Madrid, Spain, Sunday, May 11, 2014. (AP Photo/Andres Kudacki)

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Rafael Nadal from Spain poses for photographers with his trophy, after winning his Madrid Open tennis tournament, men's final match against Kei Nishikori from Japan in Madrid, Spain, Sunday, May 11, 2014. (AP Photo/Andres Kudacki)

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Rafael Nadal from Spain celebrates a point during a Madrid Open tennis tournament final match against Kei Nishikori from Japan in Madrid, Spain, Sunday, May 11, 2014. (AP Photo/Andres Kudacki)

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Rafael Nadal from Spain celebrates his victory during a Madrid Open tennis tournament semifinal match against Roberto Bautista Agut from Spain in Madrid, Spain, Saturday, May 10, 2014. (AP Photo/Andres Kudacki)

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Maria Sharapova from Russia, returns the ball during a Madrid Open tennis tournament final match against Simona Halep from Romania, in Madrid, Spain, Sunday, May 11, 2014. (AP Photo/Andres Kudacki)

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Maria Sharapova from Russia celebrates her victory holding her trophy after a Madrid Open tennis tournament final match against Simona Halep from Romania in Madrid, Spain, Sunday, May 11, 2014. (AP Photo/Andres Kudacki)