Serena Williams of the US serves to Japan's Ayumi Morita during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 19, 2013. (AP Photo/Andy Wong)

Associated Press
Serena Williams of the US serves to Japan's Ayumi Morita during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 19, 2013. (AP Photo/Andy Wong)
Serena Williams of the US serves to Japan's Ayumi Morita during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 19, 2013. (AP Photo/Andy Wong)
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