Roger Federer insists he is focused on results and not performances after surging into the quarter-finals of the French Open.

Federer resumed his fourth-round clash with Gael Monfils on Monday after bad light had forced proceedings to be brought to a halt on Sunday with the match locked at a set apiece.

But the 17-time grand slam champion had little difficulty in closing out the final two sets, winning 6-3 4-6 6-4 6-1 to progress to the last eight, where he will meet Swiss compatriot Stanislas Wawrinka.

"I hope I'm right there [playing my best]. In the first three rounds I was pretty much dominating the baseline, I could dictate play," Federer said.

"Against Gael it's different, different ball coming towards you. In a way it makes it more simple because there is only so many things you can do because of the heaviness of his shot, automatically because of that you play better tennis.

"At this stage it's about progressing in the tournament, I'd love to play my best plus progressing but I prefer moving on rather than playing my absolute best.

"I hope there is always an extra gear somewhere, I'm still physically fresh. I'm pumped up to be in the quarters again, looking forward to my next match."

Federer's only French Open title came in 2009 and, with nine-time Roland Garros winner Rafael Nadal, world number one Novak Djokovic and world number three Andy Murray still in the draw, ending that drought would seem to be a tough proposition.

When asked about the prospect of potentially winning the title, he added: "It would be unbelievable. Those thoughts creep into my mind. Everything crosses your mind.

"I'm realistic, I know there's a chance. At the same time I know hard it is. I feel there is a lot of tennis left for me to play here."