Ana Ivanović

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Ana Ivanovic of Serbia celebrates her win over Serena Williams of the U.S. in their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 19, 2014.(AP Photo/Andrew Brownbill)

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Ana Ivanovic of Serbia celebrates her win over Serena Williams of the U.S. during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 19, 2014.(AP Photo/Aaron Favila)

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Ana Ivanovic of Serbia, left, is congratulated by Serena Williams of the U.S. after Ivanovic's fourth round win at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 19, 2014.(AP Photo/Aaron Favila)

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Serena Williams of the U.S. rests on her racket during her fourth round loss to Ana Ivanovic of Serbia at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 19, 2014.(AP Photo/Aaron Favila)

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Serena Williams of the U.S. speaks during a press conference after her fourth round loss to Ana Ivanovic of Serbia at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 19, 2014. (AP Photo/Shuji Kajiyama)

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Ana Ivanovic of Serbia waves to the crowd as she celebrates her win over Serena Williams of the U.S. in their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 19, 2014.(AP Photo/Aaron Favila)

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Ana Ivanovic of Serbia celebrates a point won against Serena Williams of the U.S. during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 19, 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)

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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)