Bethanie Mattek-Sands of the U.S. reacts after defeating Agnieszka Radwanska of Poland during their women's singles match at the Sydney International tennis tournament in Sydney, Australia, Tuesday, Jan. 7, 2014.  (AP Photo/Daniel Munoz)

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Bethanie Mattek-Sands of the U.S. reacts after defeating Agnieszka Radwanska of Poland during their women's singles match at the Sydney International tennis tournament in Sydney, Australia, Tuesday, Jan. 7, 2014. (AP Photo/Daniel Munoz)

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