Defending champion Novak Djokovic set up a potential French Open quarter-final against long-time rival Rafael Nadal by moving up a gear to beat Argentine 15th seed Diego Schwartzman.
Top seed Djokovic produced his best level so far at Roland Garros to win 6-1 6-3 6-3 in the fourth-round match.
The 34-year-old Serb defended well to save seven of eight break points while taking six of his 11 chances.
Nadal, 35, will fix up the meeting if he beats Felix Auger-Aliassime later.
Like Djokovic, 13-time champion Nadal has not dropped a set on the Paris clay this year and the fifth seed will look to protect that record against an opponent who is now coached by his uncle, Toni Nadal.