Serena Williams of the US waits to during her second round match against Spain's Garbine Muguruza at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 17, 2013. (AP Photo/Andrew Brownbill)

Associated Press
Serena Williams of the US waits to during her second round match against Spain's Garbine Muguruza at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 17, 2013. (AP Photo/Andrew Brownbill)
Serena Williams of the US waits to during her second round match against Spain's Garbine Muguruza at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 17, 2013. (AP Photo/Andrew Brownbill)
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