Rhyne Williams of the U.S. chases down the ball to Juan Martin del Potro of Argentina  during 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. chases down the ball to Juan Martin del Potro of Argentina during 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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