Serbia's Novak Djokovic embraces Switzerland's Stanislas Wawrinka, facing camera, after Djokovic won their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 20, 2013. (AP Photo/Andrew Brownbill)

Associated Press
Serbia's Novak Djokovic embraces Switzerland's Stanislas Wawrinka, facing camera,  after Djokovic won their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 20, 2013.  (AP Photo/Andrew Brownbill)
Serbia's Novak Djokovic embraces Switzerland's Stanislas Wawrinka, facing camera, after Djokovic won their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 20, 2013. (AP Photo/Andrew Brownbill)
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