Ana Ivanovic of Serbia prepares to receive the ball in a match against Angelique Kerber 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)

Mideast Emirates Dubai Tennis Championships

Ana Ivanovic of Serbia prepares to receive the ball in a match against Angelique Kerber 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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