Juan Martin del Potro of Argentina returns a shot in his finals match against Bernard Tomic of Australia during the Sydney International Tennis Tournament in Sydney, Australia, Saturday, Jan. 11, 2014. Del Potro won the match 6-3, 6-1. (AP Photo/Rob Griffith)

Australia Tennis Sydney International

Juan Martin del Potro of Argentina returns a shot in his finals match against Bernard Tomic of Australia during the Sydney International Tennis Tournament in Sydney, Australia, Saturday, Jan. 11, 2014. Del Potro won the match 6-3, 6-1. (AP Photo/Rob Griffith)

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