Ana Ivanovic, of Serbia, returns the ball to Petra Kvitova, of Czech Republic, during the Sony Open tennis tournament, Monday, March 24, 2014, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)

Ana Ivanovic

Ana Ivanovic, of Serbia, returns the ball to Petra Kvitova, of Czech Republic, during the Sony Open tennis tournament, Monday, March 24, 2014, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)

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