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)

Key Biscayne Tennis

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)

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