Venus Williams

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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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Venus Williams of the U.S. serves the ball to Flavia Pennetta of Italy during the quarterfinal of the Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Thursday, Feb. 20, 2014. (AP Photo/Kamran Jebreili)

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Venus Williams of the U.S. reacts during a match against Flavia Pennetta of Italy during the quarter final of Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Thursday, Feb. 20, 2014. (AP Photo/Kamran Jebreili)

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Venus Williams of the U.S. returns the ball to Ana Ivanovic of Serbia during the third day of Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Wednesday, Feb. 19, 2014. (AP Photo/Kamran Jebreili)

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Venus Williams of the U.S. returns the ball to Elena Vesnina of Russia during the first round of Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Monday, Feb. 17, 2014. (AP Photo/Kamran Jebreili)

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Venus Williams of the U.S. reacts after she missed a ball to Elena Vesnina of Russia during the first round of Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Monday, Feb. 17, 2014. (AP Photo/Kamran Jebreili)

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Venus Williams of the U.S. returns the ball to Petra Kvitova of the Czech Republic during the third day of the WTA Qatar Ladies Open in Doha, Qatar, Wednesday, Feb. 12, 2014. (AP Photo/Osama Faisal))

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Petra Kvitova of the Czech Republic returns the ball to Venus Williams of the U.S. during the third day of the WTA Qatar Ladies Open in Doha, Qatar, Wednesday, Feb. 12, 2014. (AP Photo/Osama Faisal)

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Croatia's Petra Martic returns the ball during a match against Venus Williams of U.S during the first day of the WTA Qatar Ladies Open in Doha, Qatar, Monday, Feb. 10, 2014. (AP Photo/Osama Faisal)

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Venus Williams of U.S returns the ball during a match against Croatia's Petra Martic on the first day of the WTA Qatar Ladies Open in Doha, Qatar, Monday, Feb. 10, 2014. (AP Photo/Osama Faisal)