Article Photos: Serena Williams wins US Open quarterfinal 6-0, 6-0 3/46

Roger Federer, of Switzerland, lunges to return a shot to Tommy Robredo, of Spain, during the fourth round of the 2013 U.S. Open tennis tournament, Monday, Sept. 2, 2013, in New York. Federer lost in straight sets to Robredo. (AP Photo/David Goldman)