Juan Martin del Potro looks up to the sky after winning his men's singles 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

Juan Martin del Potro looks up to the sky after winning his men's singles 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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