Nguyen set out to defend his national title at the 2020 Canadian Championships, placing second in the short program behind Messing. Nguyen fell on both of his quad Salchow attempts in the free skate, and remained in second place overall, behind Roman Sadovsky. Skate Canada declined to determine who would take the sole men's berth at the World Championships in Montreal, and assigned the entire men's podium to compete at the 2020 Four Continents Championships in Seoul. Nguyen placed sixth at Four Continents, the highest placement among the Canadian men there, with his only error across two programs being a singled attempt at a triple Axel in the free skate.