Germany's Angelique Kerber, left, congratulates Russia's Ekaterina Makarova following during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 20, 2013. (AP Photo/Aaron Favila)

Associated Press
Germany's Angelique Kerber, left, congratulates Russia's Ekaterina Makarova following during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 20, 2013. (AP Photo/Aaron Favila)
Germany's Angelique Kerber, left, congratulates Russia's Ekaterina Makarova following during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 20, 2013. (AP Photo/Aaron Favila)
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