Serena Williams of the US waits for Russia's Maria Kirilenko to serve during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 21, 2013. (AP Photo/Dita Alangkara)

Associated Press
Serena Williams of the US waits for Russia's Maria Kirilenko to serve during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 21, 2013. (AP Photo/Dita Alangkara)
Serena Williams of the US waits for Russia's Maria Kirilenko to serve during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 21, 2013. (AP Photo/Dita Alangkara)
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