Roger Federer is yet to drop a set in the French Open this year, while Nadal also cruised into the round-of-eight with an easy victory.
Defending champion Rafael Nadal is through to the French Open quarterfinals after beating unseeded Argentine Juan Ignacio Londero 6-2, 6-3, 6-3 in their first-ever meeting.
With Londero serving to stay in the match, the second-seeded Nadal won on his first match point with a booming forehand winner.
In reaching his 38th quarterfinal at a major, Nadal moved ahead of Roy Emerson into fourth place on the all-time list. Roger Federer leads with 54.
Nadal is aiming for a record-extending 12th French Open title — which would be the most titles by a man or woman at any major.
The 32-year-old Spaniard next faces either seventh-seeded Kei Nishikori of Japan or unseeded Frenchman Benoit Paire.
They were playing their fourth-round match later Sunday.
Roger Federer still has not dropped a set at the French Open and eased into the quarterfinals with a 6-2, 6-3, 6-3 win against unseeded Argentine Leonardo Mayer.
With temperatures reaching 88 Fahrenheit (31 Celsius) on a sun-soaked center court, the third-seeded Federer was rarely troubled in beating Mayer for the fourth time in four meetings.
After dropping his serve to lose the second set, Mayer angrily swiped the ball away and was given a code violation warning for ball abuse.
It was the second time Federer has beaten Mayer at a Grand Slam— the other also coming in straight sets, in the first round of the U.S. Open in 2015.
That was also the last year Federer played at Roland Garros, before taking the decision to skip clay entirely until returning to the surface this year.
Four years ago, Federer lost in the quarterfinals to Swiss countryman Stan Wawrinka in straight sets.
Now he could get a chance to make amends, since he next faces either Wawrinka or rising star Stefanos Tsitsipas, who beat Federer in the fourth round at this year's Australian Open.
Federer is chasing a record-extending 21st Grand Slam title. He won his only French Open in 2009.
