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PARIS — Loïs Boisson never had played at the French Open, let alone in the biggest arena at Roland-Garros. Nothing fazed the French wild-card entry and now she is in the quarterfinals.

Boisson, ranked just 361st, threw her head back and roared after beating No. 3 seed Jessica Pegula 3-6, 6-4, 6-4 on Court Philippe-Chatrier in the fourth round Monday.

She is by far the lowest-ranked woman to beat someone ranked in the top five at the French Open in 40 years. The lowest previously in that span was No.