Won in only his fifth HotelPlanner Tour start at the 2025 Challenge de España after gaining promotion from the Pro Golf Tour the year prior.

The victory at Fontanals Golf Club opened playing opportunities for the remainder of the 2025 campaign, and the Frenchman took advantage. After finishing inside the top ten at the Le Vaudreuil Golf Challenge, Charmasson would notch a tied for sixth at the German Challenge powered by VcG before landing a fourth top ten of the season at the Hangzhou Open.

Charmasson would end his rookie year with a top 25 at the Rolex Grand Final supported by the R&A, a result which confirmed his first promotion to the DP World Tour.