Novak Djokovic of Serbia walks off the Rod Laver Arena after his quarterfinal loss to Stanislas Wawrinka of Switzerland at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 21, 2014.(AP Photo/Eugene Hoshiko)

Australian Open Tennis

Novak Djokovic of Serbia walks off the Rod Laver Arena after his quarterfinal loss to Stanislas Wawrinka of Switzerland at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 21, 2014.(AP Photo/Eugene Hoshiko)

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