Serbia's Novak Djokovic hits a forehand return to Switzerland's Stanislas Wawrinka during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 20, 2013. (AP Photo/Dita Alangkara)

Associated Press
Serbia's Novak Djokovic hits a forehand return to Switzerland's Stanislas Wawrinka during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 20, 2013. (AP Photo/Dita Alangkara)
Serbia's Novak Djokovic hits a forehand return to Switzerland's Stanislas Wawrinka during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 20, 2013. (AP Photo/Dita Alangkara)
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