Switzerland's Stanislas Wawrinka rests on the net after losing his fourth round match against Serbia's Novak Djokovic at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 20, 2013. (AP Photo/Andrew Brownbill)

Associated Press
Switzerland's Stanislas Wawrinka rests on the net after losing his fourth round match against Serbia's Novak Djokovic at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 20, 2013. (AP Photo/Andrew Brownbill)
Switzerland's Stanislas Wawrinka rests on the net after losing his fourth round match against Serbia's Novak Djokovic at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 20, 2013. (AP Photo/Andrew Brownbill)
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