Stanislas Wawrinka of Switzerland celebrates after defeating Novak Djokovic of Serbia in their quarterfinal at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 21, 2014.(AP Photo/Rick Rycroft)

Australian Open Tennis

Stanislas Wawrinka of Switzerland celebrates after defeating Novak Djokovic of Serbia in their quarterfinal at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 21, 2014.(AP Photo/Rick Rycroft)

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