NEW YORK — Even Roger Federer is wowed by how well he’s playing at 34 — and the ease with which he’s winning at this U.S. Open.

Federer is into his 10th semifinal at Flushing Meadows, and record 38th at all major tournaments. To get back to his first final in New York since 2009, he’ll have to beat someone he knows quite well: Swiss Olympic and Davis Cup teammate Stan Wawrinka.

The No. 2-seeded Federer and No. 5 Wawrinka won quarterfinals about as handily as can be Wednesday night.

Federer never faced a break point, compiled a remarkable 50-8 advantage in winners, and needed less than 1 1/2 hours to dismiss 12th-seeded Richard Gasquet of France 6-3, 6-3, 6-1 in Arthur Ashe Stadium.

“It’s nice to play this way,” Federer said. “And, maybe at my age, to run through five opponents the way I have done here at the U.S. Open, I don’t consider that normal, to be quite honest, even though I expect it in some ways.”

Not only has Federer won all 15 sets he’s played, he has only dropped 44 games. He has won 67 of his 69 service games. And he’s done it while playing attacking tennis; against Gasquet, he won the point on 22 of 28 trips to the net.

“I don’t feel like I’m as old as I am. I still feel young,” Federer said. “So it’s nice to get rewarded with the hard work and (know) that, actually, I’m able to play sort of `fun’ tennis.”

He hasn’t won a major title since Wimbledon in 2012, losing finals there to No. 1 Novak Djokovic last year and this July.

“It’s just nice to see how he’s moving,” Wawrinka said about Federer. “You think he’s flying on the court.”

In Friday’s other semifinal, Djokovic will face defending champion Marin Cilic. Djokovic won all 13 previous meetings.

The women’s semifinals are scheduled for Thursday night, although there is rain in the forecast.