Serena Williams upset, Venus reaches Ci

Serena Williams upset, Venus reaches Cincy semis
AP - Sports
Caroline Wozniacki, from Denmark, walks back to the baseline after missing a shot against Anastasia Pavlyuchenkova, from Russia, during a match at the Western & Southern Open tennis tournament, Friday, Aug. 17, 2012, in Mason, Ohio. Pavlyuchenkova won 6-4, 6-4. (AP Photo/Al Behrman)
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