Stanislas Wawrinka, of Switzerland, returns to Edouard Roger-Vasselin, of France, during the Sony Open Tennis in Key Biscayne, Fla., Monday, March 24, 2014. (AP Photo/J Pat Carter)

Key Biscayne Tennis

Stanislas Wawrinka, of Switzerland, returns to Edouard Roger-Vasselin, of France, during the Sony Open Tennis in Key Biscayne, Fla., Monday, March 24, 2014. (AP Photo/J Pat Carter)

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