Argentina's Juan Martin del Potro plays a forehand shot in his semifinal match against Dmitry Tursunov of Russia during the Sydney International tennis tournament in Sydney, Friday, Jan. 10, 2014. (AP Photo/Rob Griffith)

Australia Tennis Sydney International

Argentina's Juan Martin del Potro plays a forehand shot in his semifinal match against Dmitry Tursunov of Russia during the Sydney International tennis tournament in Sydney, Friday, Jan. 10, 2014. (AP Photo/Rob Griffith)

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