Angelique Kerber of Germany returns the ball to Ana Ivanovic of Serbia  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

Angelique Kerber of Germany returns the ball to Ana Ivanovic of Serbia 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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