Amit Kumar had won a silver on Monday and it is first time that India have won two medals in the men's events at the World Championships level. (Agencies)
It was Nyam-Ochir who got a good start with a takedown but 20-year-old Bajrang came back in the final seconds of the first period, pushing his his opponent out the mat to level the scores 2-2.
From then on it was no looking back as Bajrang showed his technical prowess over the Mongolian and made several attacking moves including single leg take down and back hold to seal the tie in his favour.
Early in the day, Bajrang had lost 0-7 to Vladimir Dubov of Bulgaria but he luck smiled on him and he jumped back to contention when Dubov reached the final.
He did exceedingly well in the repechage round, defeating Shogo Maeda of Japan and Ivan Guidea of Romania before getting the better of Enkhsaikhan in the bronze-medal bout.
Bajrang's performance light up India's day as Pawan Kumar (84kg) and Hitender (120kg) had made early exits from the competition.
Amit Kumar had won a silver on Monday and it is first time that India have won two medals in the men's events at the World Championships level.