Iran’s Amir Hossein Esfandiar scored 17 points, while Luburic Drazen earned 23 points for Serbia.
Team Melli will play Germany on Friday in its last match of Week 3.
The competition format is a single round robin pool with each of the 16 teams facing every other ahead of semifinals between the top four of the standings.
The semifinal winners will clash for the title, with the losers playing out for the bronze medal.
The tournament is being held in Rimini, Italy within a secure 'bubble' with all hygiene protocols in place to ensure the health and well-being of all athletes, officials and staff throughout the competition.