Matteo Arnaldi defeated Félix Auger-Aliassime 5–7, 2–6, 6–3, 6–4, 6–2 in the first round of Roland Garros on clay on 27 May 2025, pulling off an upset against the pre-match favourite. Auger-Aliassime, seeded higher in the betting odds at 1.87, struggled to maintain control after losing the opening two sets on the slow surface. Arnaldi, despite entering as the underdog at 2.05, mounted a decisive comeback from two sets down, reeling off three consecutive sets to secure the victory. The Italian's clay-court resilience proved decisive as Auger-Aliassime's form deteriorated in the latter stages of the match. The result marks a notable upset and suggests Arnaldi possesses the tactical nous and consistency required for a deep run on the Paris clay.