Rome

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United States' Christina McHale returns the ball to Italy's Camila Giorgi at the Italian open tennis tournament in Rome, Wednesday, May 14, 2014. (AP Photo/Riccardo De Luca)

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Italy's Camila Giorgi returns the ball to United States' Christina McHale at the Italian open tennis tournament in Rome, Wednesday, May 14, 2014. (AP Photo/Riccardo De Luca)

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Italy's Camila Giorgi returns the ball to United States' Christina McHale at the Italian open tennis tournament in Rome, Wednesday, May 14, 2014. (AP Photo/Riccardo De Luca)

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Britain's Andy Murray returns the ball to Spain's Marcel Granollers at the Italian open tennis tournament in Rome, Wednesday, May 14, 2014. (AP Photo/Riccardo De Luca)

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China's Na Li returns the ball to Australia's Casey Dellacqua at the Italian Open tennis tournament, in Rome, Tuesday, May 13, 2014. (AP Photo/Alessandra Tarantino)

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Novak Djokovic of Serbia returns the ball to Radek Stepanek of Czech Republic at the Italian Open tennis tournament, in Rome, Tuesday, May 13, 2014. (AP Photo/Alessandra Tarantino)

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Novak Djokovic of Serbia returns the ball to Radek Stepanek of Czech Republic at the Italian Open tennis tournament, in Rome, Tuesday, May 13, 2014. (AP Photo/Alessandra Tarantino)

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Italy's Sara Errani returns the ball to Chanelle Scheepers of South Africa at the Italian Open tennis tournament, in Rome, Tuesday, May 13, 2014. (AP Photo/Alessandra Tarantino)