Ryan Harrison of the U.S. hits a backhand to Stephane Robert of France during their men's singles match at the Sydney International tennis tournament in Sydney, Australia, Sunday, Jan. 5, 2014.  (AP Photo/Daniel Munoz)

Australia Tennis Sydney International

Ryan Harrison of the U.S. hits a backhand to Stephane Robert of France during their men's singles match at the Sydney International tennis tournament in Sydney, Australia, Sunday, Jan. 5, 2014. (AP Photo/Daniel Munoz)

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