Serena Williams

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ADVANCE FOR WEEKEND OF JAN. 11-12 - FILE - In this June 15, 2011, file photo, Serena Williams, left, warms up on a practice court as her father Richard Williams looks on before her second-round single tennis match at the Eastbourne International grass court tournament in Eastbourne, England. Serena sought a little bit of extra guidance from a tried and trusted source closer to home, spending time in the offseason with her father to fine-tune parts of her game that she thought needed improving even after a 78-4 run in 2013. (AP Photo/Sang Tan)

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Serena Williams of the United States speaks during a press conference ahead of the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 11, 2014. (AP Photo/Aaron Favila)

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Serena Williams of the United States speaks during a press conference ahead of the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 11, 2014. (AP Photo/Aaron Favila)

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Serena Williams of the United States gestures during a press conference ahead of the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 11, 2014. (AP Photo/Aaron Favila)

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Serena Williams of the U.S. celebrates with the trophy after winning the women's singles final match against Victoria Azarenka of Belarus 6-4, 7-5 during the Brisbane International tennis tournament in Brisbane, Australia, Saturday, Jan. 4, 2014. (AP Photo/Tertius Pickard)

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Victoria Azarenka of Belarus plays a shot in the women's singales final match against Serena Williams of the U.S. during the Brisbane International tennis tournament in Brisbane, Australia, Saturday, Jan. 4, 2014. (AP Photo/Tertius Pickard)

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Serena Williams of the U.S. reacts after dropping a point in the women's singles final match against Victoria Azarenka of Belarus during the Brisbane International tennis tournament in Brisbane, Australia, Saturday, Jan. 4, 2014. (AP Photo/Tertius Pickard)

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Serena Williams of the U.S. celebrates winning a point against Maria Sharapova of Russia in their semifinal match during the Brisbane International tennis tournament in Brisbane, Australia, Friday, Jan. 3, 2014. (AP Photo/Tertius Pickard)

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Serena Williams of the U.S. celebrates upon beating Maria Sharapova of Russia 6-2, 7-6 in their semifinal match during the Brisbane International tennis tournament in Brisbane, Australia, Friday, Jan. 3, 2014. (AP Photo/Tertius Pickard)