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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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Na Li of China returns the ball to Magdalena Rybarikova of Slovakia 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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Daniela Hantuchova of Slovakia reacts after winning a point during her match against Ana Ivanovic of Serbia during the second day of the WTA Qatar Ladies Open in Doha, Qatar, Tuesday Feb. 11, 2014. (AP Photo/Osama Faisal)

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Francesca Schiavone of Italy returns the ball to Magdalena Rybarikova of Slovakia during the second day of the WTA Qatar Ladies Open in Doha, Qatar, Tuesday, Feb. 11, 2014. (AP Photo/Osama Faisal)

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Magdalena Rybarikova of Slovakia returns the ball to Francesca Schiavone of Italy during the second day of the WTA Qatar Ladies Open in Doha, Qatar, Tuesday, Feb. 11, 2014. (AP Photo/Osama Faisal)

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Ana Ivanovic of Serbia returns the ball to Daniela Hantuchova of Slovakia during the second day of the WTA Qatar Ladies Open in Doha, Qatar, Tuesday Feb. 11, 2014. (AP Photo/Osama Faisal)

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Ana Ivanovic of Serbia returns the ball to Daniela Hantuchova of Slovakia during the second day of the WTA Qatar Ladies Open in Doha, Qatar, Tuesday Feb. 11, 2014. (AP Photo/Osama Faisal)