Guillamoundeguy’s first victory in a professional event came in 2022, while just a 17-year old-amateur, when he won the Red Sea Little Venice Open by a commanding eight shots.

After turning professional later that year, he won again in 2023, securing victory at the Abruzzo Alps Open.

Oihan graduated onto the European Challenge Tour in 2024 thanks to a fourth place finish on the Alps Tour order of merit in 2023.