Sony

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Stanislas Wawrinka, of Switzerland, returns to Daniel Gimeno-Traver, of Spain, at the Sony Open tennis tournament in Key Biscayne, Fla., Saturday, March 22, 2014. (AP Photo/Alan Diaz)

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Daniel Gimeno-Traver, of Spain, returns to Stanislas Wawrinka, of Switzerland, at the Sony Open tennis tournament in Key Biscayne, Fla., Saturday, March 22, 2014. (AP Photo/Alan Diaz)

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Stanislas Wawrinka, of Switzerland, keeps his eyes on the ball as he prepares to hit a shot to Daniel Gimeno-Traver, of Spain, during a match at the Sony Open tennis tournament in Key Biscayne, Fla., Saturday, March 22, 2014. (AP Photo/Alan Diaz)

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

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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)