thats not very young I've got his fights with kobayashi, marcel & huertas not sure if there is anything of him before that
Another reason why 15 rounds should be the championship distance. At that distance, you can run but you can't hide. Fernandez ran his ass off, but with 15 rounds, an aggressive fighter will eventually catch up with you and break you down.
Quality is not very good. And the stoppage was weird to me, Marcel didn't look hurt, although he rarely was throwing punches and just moving around, then they come into a clinch and Duran lands nothing really solid, but the referee steps between them and declares Duran the winner on TKO.