[4] He attended a boarding school while training at the Squash Academy in La Rochelle,[4] then when he was 16, moved to Aix-en-Provence.

[3] In October 2019 he played in his first platinum-level tournament, the Egyptian Squash Open [fr; de],[6] where he defeated the former European champion Borja Golán, the former world 4th-ranked Miguel Ángel Rodríguez[7] and the former world junior champion Ng Eain Yow[8] to reach the quarter-finals.

[10] In 2023 he reached the quarter-finals of the Canary Wharf Classic, losing to Mostafa Asal, ranked number 1 at the time.

[3] In the 2023–24 season, he beat Asal to reach the semi-finals of the 2023 Grasshopper Cup, then won the Lagord 30k in October 2023.

[11] In December 2023, Masotti won a bronze medal with France, at the 2023 Men's World Team Squash Championships in New Zealand.