British number two Heather Watson made a first-round exit from the French Open with a straight-set defeat by Kazakhstan's Zarina Diyas.
Diyas, ranked 93rd, will face Belgian 14th seed Elise Mertens or Australian qualifier Storm Sanders next.
Watson's loss leaves Johanna Konta as the only Briton remaining in the women's singles draw in Paris.
Konta, seeded 19th, plays Romania's Sorana Cirstea in her opening match later on Monday.
In the men's draw, British number two Cameron Norrie is in action against American Bjorn Fratangelo.
Watson, 29, made the perfect start as she broke Diyas' serve in the opening game but the Kazakh, 27, closed out the first set with consecutive breaks as the Briton suffered an alarming dip, losing 15 consecutive points.