Stanislas Wawrinka, of Switzerland, returns to Alexandr Dolgopolov, of Ukraine, at the Sony Open Tennis tournament in Key Biscayne, Fla., Tuesday, March 25, 2014. Dolgopolov won 6-4, 3-6, 6-1. (AP Photo/Alan Diaz)

Key Biscayne Tennis

Stanislas Wawrinka, of Switzerland, returns to Alexandr Dolgopolov, of Ukraine, at the Sony Open Tennis tournament in Key Biscayne, Fla., Tuesday, March 25, 2014. Dolgopolov won 6-4, 3-6, 6-1. (AP Photo/Alan Diaz)

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