Juan Martin del Potro of Argentina lunges to play a shot in his match against Nicolas Mahut of France during the Sydney International Tennis Tournament in Sydney, Australia, Wednesday, Jan. 8, 2014 (AP Photo/Rob Griffith)

Australia Tennis Sydney International

Juan Martin del Potro of Argentina lunges to play a shot in his match against Nicolas Mahut of France during the Sydney International Tennis Tournament in Sydney, Australia, Wednesday, Jan. 8, 2014 (AP Photo/Rob Griffith)

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