Ana Ivanovic of Serbia returns the ball to 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 returns the ball to 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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