Switzerland's Stanislas Wawrinka kicks a ball during 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 kicks a ball during 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 kicks a ball during 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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