Ana Ivanovic, of Serbia, returns the ball to Flavia Pennetta, of Italy, during the Sony Open tennis tournament, Saturday, March 22, 2014, in Key Biscayne, Fla. Ivanovic won  6-4, 6-3. (AP Photo/Luis M. Alvarez)

Sony Open Tennis

Ana Ivanovic, of Serbia, returns the ball to Flavia Pennetta, of Italy, during the Sony Open tennis tournament, Saturday, March 22, 2014, in Key Biscayne, Fla. Ivanovic won 6-4, 6-3. (AP Photo/Luis M. Alvarez)

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