Kiyani Chandeh, the current world champion, came out on top of a very tense fight that was settled by a referee decision after the athletes, both 26, finished with seven points apiece in the decisive third round.
Alizadeh had a three-point lead in the decider with six seconds left, but Kiyani Chandeh leveled with a kick to the head and was handed the victory by superiority.
Kiyani Chandeh then lost in the final, and Alizadeh claimed a bronze medal after going through a repechage process.