American Jessica Pegula, the world No. 3-ranked woman, lost to world No. 361 Lois Boisson in a shock French Open upset Monday. Boisson electrified the local crowd as she advanced to the quarterfinals, the only man or woman to reach the round this year.

Coco Gauff of the U.S. celebrates as she won the fourth round match of the French Tennis Open against Russia's Ekaterina Alexandrova at the Roland-Garros stadium in Paris, Monday, June 2, 2025. Credit: AP/Thibault Camus The crowd broke into chants of “Loïs, Loïs" and she waved back to them.

Boisson is by far the lowest-ranked woman to beat someone ranked in the top five at the French Open in 40 years.