Juan Martin del Potro of Argentina plays a shot to Dmitry Tursunov of Russia during 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 plays a shot to Dmitry Tursunov of Russia during 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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