Serbia's Novak Djokovic, left, is embraced by Radek Stepanek of the Czech Republic following their third round match at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 18, 2013. (AP Photo/Dita Alangkara)

Associated Press
Serbia's Novak Djokovic, left, is embraced by Radek Stepanek of the Czech Republic following their third round match at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 18, 2013. (AP Photo/Dita Alangkara)
Serbia's Novak Djokovic, left, is embraced by Radek Stepanek of the Czech Republic following their third round match at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 18, 2013. (AP Photo/Dita Alangkara)
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