Lois Boisson upset top-seeded Mirra Andreeva 7–6, 6–3 in the Roland Garros quarter-final on clay on 4 June 2025. Andreeva entered as the heavy favourite at 1.13 odds, with Boisson priced at 7.41, but the French player delivered a commanding performance to advance. Boisson's victory in the opening set tiebreak proved decisive, establishing momentum she sustained through the second set to secure a straight-sets triumph. The result marks a significant upset and propels Boisson into the semi-final stage of the Grand Slam, whilst ending Andreeva's bid for a maiden major title at the tournament.