New York (AFP) - World number two Roger Federer rolled into the third round of the US Open on Thursday, the 17-time Grand Slam winner still finding ways to improve his game at age 34.Federer, seeking his first US Open title since 2008 and first Grand Slam crown since Wimbledon in 2012, needed only 80 minutes to rout Belgium's Steve Darcis 6-1, 6-2, 6-1."It was on the easier side, so I was able to mix it up, was attacking, was also staying back some.