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)

Mideast Emirates Dubai Tennis Championships

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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