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Victoria Azarenka, of Belarus, reacts after winning her match against Samantha Stosur, of Australia, in the quarterfinals of the 2012 US Open tennis tournament, Tuesday, Sept. 4, 2012, in New York. (AP Photo/Mike Groll)

Victoria Azarenka, of Belarus, reacts after winning her match against Samantha Stosur, of Australia, in the quarterfinals of the 2012 US Open tennis tournament, Tuesday, Sept. 4, 2012, in New York. (AP Photo/Mike Groll)

2012 U.S. Open

Highlights from the 2012 U.S. Open Tennis Championship.