Raphaël Guillemette has been competing at the junior national level since 2015. He consistently reached the podium in the younger age categories and in 2021 qualified for the junior national team after winning silver in Boy’s Singles and gold in Boy’s Doubles in the 14U age category.
In 2023, Guillemette returned to the podium, winning gold in 16U Boy’s Singles. He repeated his gold medal performance at the 2024 National Championships, winning the 16U Boy’s Singles division for the second consecutive year. Guillemette has also represented Canada at two World Junior Championships, earning bronze medals on both occasions: in 2021 in the 16U Boy’s Doubles and in 2023 in the 16U Mixed Doubles.