The Italian Open

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Italy's Camila Giorgi returns the ball to Dominika Cibulkova of Slovakia, at the Italian Open tennis tournament, in Rome, Tuesday, May 13, 2014. (AP Photo/Alessandra Tarantino)

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Italy's Camila Giorgi serves the ball to Dominika Cibulkova of Slovakia at the Italian Open tennis tournament, in Rome, Tuesday, May 13, 2014. (AP Photo/Alessandra Tarantino)

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Italy's Camila Giorgi returns the ball to Dominika Cibulkova of Slovakia, at the Italian Open tennis tournament, in Rome, Tuesday, May 13, 2014. (AP Photo/Alessandra Tarantino)

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Roger Federer of Switzerland to reporters' questions during a press conference at the Italian Open tennis tournament, in Rome, Tuesday, May 13, 2014. (AP Photo/Alessandra Tarantino)

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Roger Federer of Switzerland listens to reporters' questions during a press conference at the Italian Open tennis tournament, in Rome, Tuesday, May 13, 2014. (AP Photo/Alessandra Tarantino)

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Roger Federer of Switzerland listens to reporters' questions during a press conference at the Italian Open tennis tournament, in Rome, Tuesday, May 13, 2014. (AP Photo/Alessandra Tarantino)

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Venus Williams of the United States returns the ball to Annika Beck of Germany at the Italian Open tennis tournament, in Rome, Monday, May 12, 2014. (AP Photo/Alessandra Tarantino)

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Serena Williams, of the United States, attends a press conference ahead of her participation to the Italian Open tennis tournament, in Rome, Monday, May 12, 2014. (AP Photo/Riccardo De Luca)