Sept. 4 (Bloomberg) -- Top seed Victoria Azarenka defeated defending champion Samantha Stosur in three sets to reach the semifinals of the U.S. Open at the National Tennis Center in New York.
Azarenka, 23, of Belarus, won 6-1, 4-6, 7-6 (7-5). Stosur, 28, of Australia, was seeded seventh.
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