Kei Nishikori, of Japan, listens to a question at a news conference after he withdrew from his semifinal match against Novak Djokovic due to a left groin injury at the Sony Open tennis tournament, Friday, March 28, 2014, in Key Biscayne, Fla. (AP Photo/Lynne Sladky)

Key Biscayne Tennis

Kei Nishikori, of Japan, listens to a question at a news conference after he withdrew from his semifinal match against Novak Djokovic due to a left groin injury at the Sony Open tennis tournament, Friday, March 28, 2014, in Key Biscayne, Fla. (AP Photo/Lynne Sladky)

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