"I dedicate (the gold) to all my family, my mum, my dad, my sisters, I wish they are proud of me." His gold medal is only the fifth won by a Tunisian athlete at the Olympics, but their third in swimming. Hafnaoui powered home over the last 50m, touching the wall in 3:43.36, far quicker than the 3:45.68 he swam in qualifying on Saturday. Hafnaoui, whose father Mohamed Hafnaoui was a former member of the national basketball team, will race in the 800m freestyle on Tuesday. (Reporting by Farah Master in Hong Kong; additional reporting by Aaron Sheldrick in Tokyo; Editing by Peter Rutherford)