Serbia's Novak Djokovic waves as he leaves Rod Laver Arena after defeating Radek Stepanek of the Czech Republic in 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 waves as he leaves Rod Laver Arena after defeating Radek Stepanek of the Czech Republic in 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 waves as he leaves Rod Laver Arena after defeating Radek Stepanek of the Czech Republic in 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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