Bethanie Mattek-Sands of the U.S. hits a forehand to 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)

APTOPIX Australia Tennis Sydney International

Bethanie Mattek-Sands of the U.S. hits a forehand to 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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