Serbia's Novak Djokovic, right, embraces Switzerland's Stanislas Wawrinka after winning their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 21, 2013.(AP Photo/Andy Wong)
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Serbia's Novak Djokovic, right, embraces Switzerland's Stanislas Wawrinka after winning their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 21, 2013.(AP Photo/Andy Wong)
