Ana Ivanovic, of Serbia, hits a return to Flavia Pennetta, of Italy, during a match at the Sony Open tennis tournament, Saturday, March 22, 2014, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)

Sony Open Tennis

Ana Ivanovic, of Serbia, hits a return to Flavia Pennetta, of Italy, during a match at the Sony Open tennis tournament, Saturday, March 22, 2014, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)

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