Dmitry Tursunov of Russia falls after playing a shot at the net to Juan Martin del Potro of Argentina 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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Dmitry Tursunov of Russia falls after playing a shot at the net to Juan Martin del Potro of Argentina 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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