Serbia's Novak Djokovic makes a forehand return to Ryan Harrison of the US during their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 16, 2013. (AP Photo/Rob Griffith)

Associated Press
Serbia's Novak Djokovic makes a forehand return to Ryan Harrison of the US during their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 16, 2013. (AP Photo/Rob Griffith)
Serbia's Novak Djokovic makes a forehand return to Ryan Harrison of the US during their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 16, 2013. (AP Photo/Rob Griffith)
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