United Arab Emirates

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Serena Williams of the U.S. returns the ball to Ekaterina Makarova of Russia during the second round of Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Tuesday, Feb. 18, 2014. (AP Photo/Kamran Jebreili)

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Serena Williams of the U.S. reacts after winning a point against Ekaterina Makarova of Russia during the second round of Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Tuesday, Feb. 18, 2014. (AP Photo/Kamran Jebreili)

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Caroline Wozniacki of Denmark reacts after she got a point against Sabine Lisicki of Germany during the second round of Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Tuesday, Feb. 18, 2014. (AP Photo/Kamran Jebreili)

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Caroline Wozniacki of Denmark serves the ball to Sabine Lisicki of Germany during the second round of Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Tuesday, Feb. 18, 2014. (AP Photo/Kamran Jebreili)

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Ahead of the talks, Secretary of State John F. Kerry blasted Iran and Russia for continuing to support the Syrian regime in its 3-year-old civil war, after he arrived Monday in the United Arab Emirates. (Associated Press)

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Serena Williams of the U.S. watches her sister Venus, unseen, in a match against Elena Vesnina of Russia during the first round of Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Monday, Feb. 17, 2014. (AP Photo/Kamran Jebreili)

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Carla Suarez Navarro of Spain returns the ball to Nadia Petrova of Russia during the first round of Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Monday, Feb. 17, 2014. (AP Photo/Kamran Jebreili)

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Lucie Safarova of Czech Republic returns the ball to Sloane Stephens of the U.S. during the first round of Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Monday, Feb. 17, 2014. (AP Photo/Kamran Jebreili)

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Venus Williams of the U.S. returns the ball to Elena Vesnina of Russia during the first round of Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Monday, Feb. 17, 2014. (AP Photo/Kamran Jebreili)

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Venus Williams of the U.S. reacts after she missed a ball to Elena Vesnina of Russia during the first round of Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Monday, Feb. 17, 2014. (AP Photo/Kamran Jebreili)