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Petra Kvitova, of 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 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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