Juan Martin del Potro of Argentina hits a backhand to Bernard Tomic of Australia during the final of the Sydney International tennis tournament in Sydney, Australia, Saturday, Jan. 11, 2014.  (AP Photo/Daniel Munoz)

Australia Tennis Sydney International

Juan Martin del Potro of Argentina hits a backhand to Bernard Tomic of Australia during the final of the Sydney International tennis tournament in Sydney, Australia, Saturday, Jan. 11, 2014. (AP Photo/Daniel Munoz)

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