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



Mardy Fish serves to Gilles Simon, of France, during a match at the U.S. Open tennis tournament Saturday, Sept. 1, 2012 in New York. (AP Photo/Darron Cummings)

Mardy Fish serves to Gilles Simon, of France, during a match at the U.S. Open tennis tournament Saturday, Sept. 1, 2012 in New York. (AP Photo/Darron Cummings)