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

Key Biscayne Tennis

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

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