Rome

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Serbia's Ana Ivanovic returns the ball to Italy Karin Knapp at the Italian open tennis tournament in Rome, Monday, May 12, 2014. (AP Photo/Riccardo De Luca)

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Bulgaria's Grigor Dimitrov reacts after winning a point against France's Edouard Roger-Vasselin at the Italian open tennis tournament in Rome, Monday, May 12, 2014. (AP Photo/Riccardo De Luca)

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Bulgaria's Grigor Dimitrov returns the ball to France's Edouard Roger-Vasselin at the Italian open tennis tournament in Rome, Monday, May 12, 2014. (AP Photo/Riccardo De Luca)

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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)

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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)

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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)

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

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Pope Francis listens to the students cheering him as he arrives for an audience with students and staff of Rome's ecclesiastical colleges, in the Paul VI hall at the Vatican, Monday, Nov. 12, 2014. (AP Photo/Alessandra Tarantino)