Maria Sharapova, of Russia, returns to Petra Kvitova, of Czech Republic, at the Sony Open Tennis tournament, Tuesday, March 25, 2014, in Key Biscayne, Fla. (AP Photo/Lynne Sladky)

Key Biscayne Tennis

Maria Sharapova, of Russia, returns to Petra Kvitova, of Czech Republic, at the Sony Open Tennis tournament, Tuesday, March 25, 2014, in Key Biscayne, Fla. (AP Photo/Lynne Sladky)

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