Argentina's Juan Martin Del Potro reaches for a backhand return to France's Jeremy Chardy during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 19, 2013. (AP Photo/Rob Griffith)

Associated Press
Argentina's Juan Martin Del Potro reaches for a backhand return to France's Jeremy Chardy during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 19, 2013. (AP Photo/Rob Griffith)
Argentina's Juan Martin Del Potro reaches for a backhand return to France's Jeremy Chardy during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 19, 2013. (AP Photo/Rob Griffith)
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