Rhyne Williams of the U.S. returns to Juan Martin del Potro of Argentina  in their first round match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 14, 2014. (AP Photo/Andrew Brownbill)

Australian Open Tennis

Rhyne Williams of the U.S. returns to Juan Martin del Potro of Argentina in their first round match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 14, 2014. (AP Photo/Andrew Brownbill)

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