Novak Djokovic of Serbia reacts after he missed a ball against Roger Federer of Switzerland during a semi final match of the Dubai Tennis Championships in Dubai, United Arab Emirates, Friday, Feb. 28, 2014. (AP Photo/Kamran Jebreili)

Mideast Emirates Dubai Tennis Championships

Novak Djokovic of Serbia reacts after he missed a ball against Roger Federer of Switzerland during a semi final match of the Dubai Tennis Championships in Dubai, United Arab Emirates, Friday, Feb. 28, 2014. (AP Photo/Kamran Jebreili)

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