Novak Djokovic of Serbia takes a drink between games as he plays Fabio Fognini of Italy during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 19, 2014.(AP Photo/Eugene Hoshiko)

Australian Open Tennis

Novak Djokovic of Serbia takes a drink between games as he plays Fabio Fognini of Italy during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 19, 2014.(AP Photo/Eugene Hoshiko)

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