Kei Nishikori, of Japan, cools off between sets during the match against 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, cools off between sets during the match against 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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