Roger Federer reached a record 28th successive Grand Slam quarter-final on Sunday when he defeated Swiss compatriot Stanislas Wawrinka 6-3, 6-2, 7-5 in the French Open last 16.
Third seed Federer, the 2009 champion, will face either Spain's David Ferrer or Gael Monfils of France for a place in the semi-finals.
Federer has reached the quarter-finals without dropping a set as he continues to thrive at a Roland Garros tournament where the world's top two Rafael Nadal and Novak Djokovic are expected to reach the final.
"I am super-happy because I knew after he beat (Jo-Wilfried) Tsonga, when he really dominated in the last two sets, what the danger was," said Federer.
"He showed all his qualities in the third set and was a bit unlucky but all the better for me I guess."
With victory on Sunday, in a repeat of the match-up at the same stage of Roland Garros last year, Federer took his career record to 9-1 against Wawrinka, his Beijing Olympics doubles gold medal-winning partner.
He cruised to a two-set lead courtesy of a break in the fourth game of the opener and two breaks in the third and fifth games of the second set against Wawrinka, who needed five sets to beat Tsonga in the last round.
Wawrinka, with Federer's former coach Peter Lundgren in his corner, rallied to lead 3-0 with a break in the third set.
But 16-time Grand Slam winner Federer came roaring back in the seventh and 11th games before securing victory with his eighth ace.