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

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