United Arab Emirates

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Spain's Roberto Bautista-Agut returns the ball to Novak Djokovic of Serbia during the third day of the Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Wednesday, Feb. 26, 2014. (AP Photo/Kamran Jebreili)

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Malek Jaziri of Tunisia returns the ball to Somdev Devvarman of India during the third day of the Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Wednesday, Feb. 26, 2014. (AP Photo/Kamran Jebreili)

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Tomas Berdych of Czech returns the ball to Sergiy Stakhovsky of Ukraine during the third day of the Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Wednesday, Feb. 26, 2014. (AP Photo/Kamran Jebreili)

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Novak Djokovic of Serbia serves the ball to Denis Istomin of Uzbekistan during the second round of the Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Tuesday, Feb. 25, 2014. (AP Photo/Kamran Jebreili)

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Novak Djokovic of Serbia returns the ball to Denis Istomin of Uzbekistan during the second round of the Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Tuesday, Feb. 25, 2014. (AP Photo/Kamran Jebreili)

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Novak Djokovic of Serbia returns the ball to Denis Istomin of Uzbekistan during the second round of the Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Tuesday, Feb. 25, 2014. (AP Photo/Kamran Jebreili)

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Somdev Devvarman of India returns the ball to Juan Martin Del Potro of Argentina during the second round of the Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Tuesday, Feb. 25, 2014. (AP Photo/Kamran Jebreili)

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Juan Martin Del Potro of Argentina reacts after he lost a point against Somdev Devvarman of India during the second round of the Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Tuesday, Feb. 25, 2014. (AP Photo/Kamran Jebreili)

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Tomas Berdych of the Czech Republic returns the ball to Marius Copil of Romania during the second round of the Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Tuesday, Feb. 25, 2014. (AP Photo/Kamran Jebreili)

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Tomas Berdych of the Czech Republic returns the ball to Marius Copil of Romania during the second round of the Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Tuesday, Feb. 25, 2014. (AP Photo/Kamran Jebreili)

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The Associated Press executive editor Kathleen Carroll speaks at the International Government Communication Forum, in Sharjah, United Arab Emirates, Monday, Feb. 24, 2014. Carroll called on governments around the world to support an independent press, warning Monday that efforts to silence the media through intimidation and violence are “in effect an attack on a nation’s people.” (AP Photo/Al Moutasim Al Maskery)

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The Associated Press executive editor Kathleen Carroll speaks at the International Government Communication Forum, in Sharjah, United Arab Emirates, Monday, Feb. 24, 2014. Carroll called on governments around the world to support an independent press, warning Monday that efforts to silence the media through intimidation and violence are “in effect an attack on a nation’s people.” (AP Photo/Al Moutasim Al Maskery)