Caroline Wozniacki of Denmark returns the ball to Sabine Lisicki 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

Caroline Wozniacki of Denmark returns the ball to Sabine Lisicki 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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