Rafael Nadal and Roger Federer stayed on course for a semi-final meeting at the French Open as both coasted into the last eight with straight-set wins.
Eleven-time champion Nadal beat Argentina’s Juan Ignacio Londero 6-2 6-3 6-3 in two hours 13 minutes.
Federer beat another Argentine, Leonardo Mayer, by the same scoreline.
He plays Stan Wawrinka next after his fellow Swiss prevailed in a marathon five-set wrestle with Greek sixth seed Stefanos Tsitsipas.
Nadal will face either Japan’s Kei Nishikori or France’s Benoit Paire.
On past form, Nadal would have greater reason for optimism should he meet Federer in the last four, having won all five of their matches at Roland Garros.
Federer, whose sole Roland Garros title came in 2009, is yet to drop a set in the tournament, after straightforward wins over Lorenzo Sonego, Oscar Otte and Casper Ruud, ranked 74th, 144th and 63rd in the world respectively, and Mayer never looked likely to dent his progress.
Victory assured Federer another piece of tennis history as he matched American great Chris Evert‘s record of 54 Grand Slam quarter-final singles appearances in the Open era.