Serbia

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Ana Ivanovic of Serbia reacts between points as she plays Samantha Stosur of Australia during their third round match at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 17, 2014.(AP Photo/Aaron Favila)

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Ana Ivanovic of Serbia celebrates a match point won over Samantha Stosur of Australia during their third round match at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 17, 2014.(AP Photo/Aaron Favila)

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Novak Djokovic of Serbia makes a forehand return to Denis Istomin of Uzbekistan during their third round match at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 17, 2014.(AP Photo/Andrew Brownbill)