Kei Nishikori, of Japan, returns to David Ferrer, of Spain, at the Sony Open Tennis tournament in Key Biscayne, Fla., Tuesday, March 25, 2014. (AP Photo/Alan Diaz)

Key Biscayne Tennis

Kei Nishikori, of Japan, returns to David Ferrer, of Spain, at the Sony Open Tennis tournament in Key Biscayne, Fla., Tuesday, March 25, 2014. (AP Photo/Alan Diaz)

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