By Larry Fine
Showing no signs of slowing down in his first grand slam tournament as a 30-year-old, Federer used his serve as a lethal weapon, whipped angled winners with his groundstrokes and played superbly at the net.
The third-seeded Federer advanced to a scintillating showdown in the last four against top-seeded Novak Djokovic and his eighth straight U.S. Open semi.
World number one Djokovic, the Australian and Wimbledon champion, reached the semis when his Serbian Davis Cup team mate Janko Tipsarevic retired with a leg injury while trailing 7-6 6-7 6-0 3-0.
"I played great," Federer said in an on-court interview. "For me it continues, and that is awesome.
"I'm very happy with the way I'm playing, the way I'm moving and I'm enjoying myself on the court."
(Editing by Julian Linden)
Receive your weekly recap of all the happenings around the world of sports.