Raphaël Guillemette has been competing at the junior national level since 2015 when he played in the U8 events. Guillemette has been on the podium in the younger age categories each year and in 2021 won his first medals in the 14U divisions, winning silver in Boy’s Singles and gold in Boy’s Doubles. These results earned Guillemette a spot on his first Junior National Team. In 2023, Guillemette returned to the podium, winning gold in the U16 Boy’s Singles. Guillemette represented Canada at the 2021 Junior World Championships where he won bronze in U14 Boy’s Doubles with partner Asher Pocsai.