Roger Federer and Rafael Nadal both earned identical wins over Argentinian opposition at the French Open to move into the quarter-finals at Roland Garros.
Third seed Federer continued his straightforward progress through the draw with a 6-2 6-3 6-3 victory over Argentina's Leonardo Mayer.
Federer is one of three men in the draw yet to drop a set and he brushed aside Mayer in just an hour and 42 minutes.
The 37-year-old did not face a break point in the match, losing only eight points on his first serve, and hit 30 winners.
Rafael Nadal followed Federer onto Court Philippe Chatrier and emerged with an identical win, beating another Argentinian, Juan Ignacio Londero, 6-2 6-3 6-3.
Nadal had dropped a set in his third-round clash with David Goffin but was in no mood to repeat that against Londero, who is making his debut at Roland Garros this year.
He managed one break of the Nadal serve to claw his way back from 4-1 to 4-3 down in the third set but that was as good as it got.
Federer will play his old friend and rival Stan Wawrinka after the 34-year-old won an extraordinary contest against sixth seed Stefanos Tsitsipas.
The pair battled for five hours and nine minutes on Court Suzanne Lenglen before Wawrinka eventually triumphed 7-6 (6) 5-7 6-4 3-6 8-6.
The 2015 champion was twice a set up against the young Greek pretender, but Tsitsipas showed again what a superb competitor he is to fight back and it was he who looked like he would move ahead in the deciding set.
But Wawrinka dug in to save eight break points and then took his second match point when the umpire confirmed a desperate backhand had caught the edge of the line.
