Five-time US Open champion Roger Federer has claimed that the beginning of his campaigns at Flushing Meadows are always "quite strong".

The 34-year-old is yet to drop a set as he booked a place in the third round of the tournament by beating Steve Darcis on Thursday.

"Very often I started this tournament quite strong," Federer told reporters. "It's always gone quite well for me. I've always enjoyed conditions here, the balls, the speed of the court, the atmosphere in the arena. It's always worked very well for me.

"I think this year is another good year. Doing the right things on the court. I was able to mix it up, was attacking, was also staying back some. I was pretty much all-out attack as much as I could. Obviously I have to manage that against different players when the scoreline isn't maybe so one-sided."

Federer last won the US Open in 2008.