Juan Martin Del Potro of Argentina looks up after defeating Dmitry Tursunov of Russia in their men's singles semifinal match at the Sydney International tennis tournament in Sydney, Friday, Jan. 10, 2014. Del Potro won the match 6-4, 6-2. (AP Photo/Rick Rycroft)

Australia Tennis Sydney International

Juan Martin Del Potro of Argentina looks up after defeating Dmitry Tursunov of Russia in their men's singles semifinal match at the Sydney International tennis tournament in Sydney, Friday, Jan. 10, 2014. Del Potro won the match 6-4, 6-2. (AP Photo/Rick Rycroft)

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