US Open champion Sloane Stephens reached her first Roland Garros quarter-final on Sunday, beating Estonia's Anett Kontaveit 6-2, 6-0.
Stephens, the 10th seed, had previously made the fourth round for four successive seasons.
She will face either Australian Open champion and second seed Caroline Wozniacki or Russia's Daria Kasatkina for a place in the semi-finals.
A clearly hobbled Kontaveit hit just five winners but 21 unforced errors in the 52-minute mismatch.
Easy does it: Sloane Stephens routs Anett Kontaveit on Sunday