Defending champions Gustavo Fernández and Diede de Groot advanced from the quarter-finals as the men's and women's wheelchair singles competitions got underway at the French Open in Paris.
Argentina's Fernández was up against Gordon Reid of Britain, the player he defeated in last year's final.
Fernández triumphed 6-3, 6-3.
Japan's Shingo Kunieda, the runner-up at Roland Garros in 2019 and the top seed, defeated French wild-card Frédéric Cattaneo 6-2, 6-0.
It was a disappointing day for the host nation as two-time champion Stéphane Houdet lost to Britain's Alfie Hewett - the French Open winner in 2017 - and the third French player in the draw, Nicolas Peifer, fell to Belgium's Joachim Gérard.
Gérard won 6-4, 6-3, while Hewett triumphed 7-5, 6-3.
In contrast, three of the four women's quarter-finals went to three sets.
De Groot, the Dutch top seed, beat Jordanne Whiley of Britain 6-3, 0-6, 6-1 in a topsy-turvy affair.
De Groot is chasing a ninth singles Grand Slam title, and her second at the French Open.
Mijn eerste partij op @rolandgarros was zeker geen makkelijke partij, gelukkig won ik uiteindelijk met 6-3 0-6 6-1 van de Britse Whiley. Morgen tref ik in de halve finale de Japanse Ohtani (3de partij na 11:00 uur). #Grandslam #eersteronde #yonexbenelux #SunriseMedical— Diede de Groot (@DiedetheGreat) October 7, 2020
Second seed Yui Kamiji of Japan came from a set down to beat The Netherlands' Marjolein Buis.
The reward for her 6-7 (7-9), 6-2, 6-1 victory is a match versus Buis' compatriot Aniek van Koot.
Van Koot beat France's Charlotte Famin 6-4, 4-6, 6-3 to book a place in the last eight.
Japan's Momoko Ohtani is the last semi-finalist, ensuring they will both be Dutch-Japanese clashes.
Ohtani defeated South Africa's Kgothatso Montjane 6-4, 6-1.