Germany's Angelique Kerber celebrates after defeating Madison Keys of the US in their third round match at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 18, 2013. (AP Photo/Dita Alangkara)

Associated Press
Germany's Angelique Kerber celebrates after defeating Madison Keys of the US in their third round match at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 18, 2013. (AP Photo/Dita Alangkara)
Germany's Angelique Kerber celebrates after defeating Madison Keys of the US in their third round match at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 18, 2013. (AP Photo/Dita Alangkara)
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