The Tunisian swimmer relives his journey to the 400m freestyle gold medal, one of the major shock results at Tokyo 2020 in 2021. 18-year-old Hafnaoui... shares why he looks up to double Olympic champion Ous Mellouli, and how the experience he gained from swimming at the Buenos Aires Youth Olympic Games in 2018 helped him grow in confidence, with more gold in his sights for the future.