The Australian Open

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Dominika Cibulkova of Slovakia celebrates after defeating Simona Halep of Romania in their quarterfinal at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 22, 2014.(AP Photo/Rick Rycroft)

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Dominika Cibulkova of Slovakia celebrates after defeating Simona Halep of Romania in their quarterfinal at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 22, 2014.(AP Photo/Eugene Hoshiko)

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Agnieszka Radwanska of Poland celebrates after defeating Victoria Azarenka of Belarus during their quarterfinal at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 22, 2014.(AP Photo/Aaron Favila)

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Li Na of China hits the ball to the crowd after defeating Flavia Pennetta of Italy 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 practices serving during a training session at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 22, 2014. Bouchard will face Li Na of China in the women's singles semifinal Thursday.(AP Photo/Aijaz Rahi)