Sabine Lisicki of Germany returns the ball to Caroline Wozniacki of Denmark 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

Sabine Lisicki of Germany returns the ball to Caroline Wozniacki of Denmark 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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