American teenager Coco Gauff set up a potential rematch of last year's French Open final with Iga Swiatek by moving into the Roland Garros last eight.
Sixth seed Gauff, 19, beat Slovakia's Anna Karolina Schmiedlova 7-5 6-2 and could face top seed Swiatek next.
Poland's Swiatek, going for a third title on the clay, faces Ukraine's Lesia Tsurenko later on Monday.
Tunisia's Ons Jabeur moved into the quarter-finals for the first time with a 6-3 6-1 win over Bernarda Pera.
Jabeur played in the Wimbledon and US Open finals in 2022 but lost in the first round at Roland Garros last year.