Kei Nishikori from Japan returns the ball during a Madrid Open tennis tournament match against David Ferrer in Madrid, Spain, Saturday, May 10, 2014 . (AP Photo/Daniel Ochoa de Olza)

Spain Madrid Open Tennis

Kei Nishikori from Japan returns the ball during a Madrid Open tennis tournament match against David Ferrer in Madrid, Spain, Saturday, May 10, 2014 . (AP Photo/Daniel Ochoa de Olza)

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