Stanislas Wawrinka, of Switzerland, returns to Edouard Roger-Vasselin at the Sony Open Tennis tournament, Monday, March 24, 2014, in Key Biscayne, Fla. (AP Photo/Lynne Sladky)

Key Biscayne Tennis

Stanislas Wawrinka, of Switzerland, returns to Edouard Roger-Vasselin at the Sony Open Tennis tournament, Monday, March 24, 2014, in Key Biscayne, Fla. (AP Photo/Lynne Sladky)

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