The 19-year-old world number two bagged his third trophy of 2023, after winning in Buenos Aires and Indian Wells, and the ninth of his career.
With 14-time French Open champion Rafael Nadal sidelined since January with a hip injury and world number one and two-time Roland Garros winner Novak Djokovic struggling with an elbow problem, Alcaraz will be a major contender to add the clay-court Grand Slam title to the US Open he captured last year.