Rhyne Williams of the U.S. serves 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. serves 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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