S. Williams, Federer ease into US Open's 4th round

AP - Sports
S. Williams, Federer ease into US Open's 4th round
Italy's Roberta Vinci celebrates after winning her match against Slovakia's Dominika Cibulkova in the third round of play at the 2012 US Open tennis tournament, Saturday, Sept. 1, 2012, in New York. (AP Photo/Mel C. Evans)
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