Caroline Wozniacki

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Caroline Wozniacki of Denmark returns the ball to Venus Williams of the U.S.during a semi final match of Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Friday, Feb. 21, 2014. (AP Photo/Kamran Jebreili)

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Venus Williams of the U.S. celebrates after she beats Caroline Wozniacki of Denmark during a semi final match of Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Friday, Feb. 21, 2014. (AP Photo/Kamran Jebreili)

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Caroline Wozniacki of Denmark returns the ball to Venus Williams of the U.S.during a semi final match of Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Friday, Feb. 21, 2014. (AP Photo/Kamran Jebreili)

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Venus Williams of the U.S. celebrates after she beats Caroline Wozniacki of Denmark during a semi final match of Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Friday, Feb. 21, 2014. (AP Photo/Kamran Jebreili)

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Venus Williams of the U.S. returns the ball to Caroline Wozniacki of Denmark during a semi final match of Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Friday, Feb. 21, 2014. (AP Photo/Kamran Jebreili)

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Caroline Wozniacki of Denmark reacts after she got a point against 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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Caroline Wozniacki of Denmark serves 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)