Azarenka surprises Sharapova in 3; Williams next

AP - Sports
Azarenka surprises Sharapova in 3; Williams next
Juan Martin del Potro, of Argentina, stretches for a return to Novak Djokovic, of Serbia, during a quarterfinal at the U.S. Open tennis tournament, Thursday, Sept. 6, 2012, in New York. (AP Photo/Charles Krupa)
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