Ana Ivanović

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Venus Williams of the U.S. returns the ball to Ana Ivanovic of Serbia during the third day of Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Wednesday, Feb. 19, 2014. (AP Photo/Kamran Jebreili)

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Daniela Hantuchova of Slovakia reacts after winning a point during her match against Ana Ivanovic of Serbia during the second day of the WTA Qatar Ladies Open in Doha, Qatar, Tuesday Feb. 11, 2014. (AP Photo/Osama Faisal)

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Ana Ivanovic of Serbia returns the ball to Daniela Hantuchova of Slovakia during the second day of the WTA Qatar Ladies Open in Doha, Qatar, Tuesday Feb. 11, 2014. (AP Photo/Osama Faisal)

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Ana Ivanovic of Serbia returns the ball to Daniela Hantuchova of Slovakia during the second day of the WTA Qatar Ladies Open in Doha, Qatar, Tuesday Feb. 11, 2014. (AP Photo/Osama Faisal)

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Ana Ivanovic of Serbia makes a backhand return to Eugenie Bouchard of Canada during their quarterfinal at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 21, 2014.(AP Photo/Rick Rycroft)

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Eugenie Bouchard of Canada, holding stuffed doll of wombat, celebrates after defeating Ana Ivanovic of Serbia during their quarterfinal at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 21, 2014. (AP Photo/Aaron Favila)

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Supporters of Canada's Eugenie Bouchard watch her quarterfinal against Ana Ivanovic of Serbia at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 21, 2014. (AP Photo/Andrew Brownbill)

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Eugenie Bouchard of Canada celebrates after defeating Ana Ivanovic of Serbia during their quarterfinal at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 21, 2014. (AP Photo/Rick Rycroft)