The Australian Open

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Maria Sharapova of Russia hits a forehand return to Alize Cornet of France during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2014.(AP Photo/Aaron Favila)

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Novak Djokovic of Serbia celebrates after his win over Denis Istomin of Uzbekistan 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 changes his shirt between games as he plays Denis Istomin of Uzbekistan 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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Samantha Stosur of Australia celebrates a point won against Ana Ivanovic of Serbia 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 hits a smash to Samantha Stosur of Australia during their third round match at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 17, 2014.(AP Photo/Andrew Brownbill)

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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)