Roger Federer from Switzerland returns the ball during the match against Kei Nishikori from Japan at the Madrid Open tennis tournament, in Madrid, Thursday, May 9, 2013. (AP Photo/Andres Kudacki)

Associated Press
Roger Federer from Switzerland returns the ball during the match against Kei Nishikori from Japan at the Madrid Open tennis tournament, in Madrid, Thursday, May 9, 2013. (AP Photo/Andres Kudacki)
Roger Federer from Switzerland returns the ball during the match against Kei Nishikori from Japan at the Madrid Open tennis tournament, in Madrid, Thursday, May 9, 2013. (AP Photo/Andres Kudacki)
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