Defending champ Azarenka advances to quarterfinals

AP - Sports
Defending champ Azarenka advances to quarterfinals
Serbia's Novak Djokovic rips his shirt off as he celebrates his fourth round win over Switzerland's Stanislas Wawrinka at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 21, 2013. (AP Photo/Dita Alangkara)
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