Serena, left, and Venus Williams of the United States walk on the court during their doubles match against Camila Giorgi of Italy and Stefanie Voegele of Switzerland at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 17, 2013. (AP Photo/Aaron Favila)

Associated Press
Serena, left, and Venus Williams of the United States walk on the court during their doubles match against  Camila Giorgi of Italy and Stefanie Voegele of Switzerland at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 17, 2013. (AP Photo/Aaron Favila)
Serena, left, and Venus Williams of the United States walk on the court during their doubles match against Camila Giorgi of Italy and Stefanie Voegele of Switzerland at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 17, 2013. (AP Photo/Aaron Favila)
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