Kei Nishikori
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Ivan Dodig from Croatia serves during a Madrid Open tennis tournament match against Kei Nishikori from Japan, in Madrid, Spain, Monday, May 5, 2014. (AP Photo/Andres Kudacki)

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Kei Nishikori from Japan returns the ball during a Madrid Open tennis tournament match against Ivan Dodig from Croatia, in Madrid, Spain, Monday, May 5, 2014. (AP Photo/Andres Kudacki)

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Kei Nishikori of Japan, returns a shot from Roger Federer of Switzerland, at the Sony Open Tennis tournament, Wednesday, March 26, 2014 in Key Biscayne, Fla. (AP Photo/Wilfredo Lee)

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Kei Nishikori of Japan, returns a shot from Roger Federer of Switzerland, at the Sony Open Tennis tournament, Wednesday, March 26, 2014 in Key Biscayne, Fla. (AP Photo/Wilfredo Lee)

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Kei Nishikori of Japan, serves to Roger Federer of Switzerland, at the Sony Open Tennis tournament, Wednesday, March 26, 2014 in Key Biscayne, Fla. (AP Photo/Wilfredo Lee)

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Roger Federer of Switzerland, returns a shot from Kei Nishikori of Japan, at the Sony Open Tennis tournament, Wednesday, March 26, 2014 in Key Biscayne, Fla. (AP Photo/Wilfredo Lee)