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Stosur, the 2011 U.S. Open champion, broke her unseeded opponent's serve seven times in the quarterfinal while never facing a break point herself.
Stosur, ranked ninth in the world, will meet Kai-chen Chang of Taiwan on Saturday, after the unseeded Chang ousted eighth-seeded Laura Robson of Britain 6-4, 3-6, 7-6 (4).
Copyright 2012 by The Associated Press
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