"I'm moving well, I'm serving well, I'm hitting the ball clean," Federer told reporters. "Today I thought on a very hot day with fast conditions, I was able to control the ball.
"I didn't really struggle too much on his serve today for some reason. I was able to return great, and I think that was a big key.
"Then I think I was serving the right way, even though I didn't have the highest first serve percentage."
Today's match was Federer's 31st consecutive Grand Slam quarter-final.