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

AP - Sports
S. Williams, Federer ease into US Open's 4th round
Russia's Ekaterina Makarova returns a shot to Serena Williams in the third round of play at the 2012 US Open tennis tournament, Saturday, Sept. 1, 2012, in New York. (AP Photo/Kathy Willens)
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