Reigning national champion and National Games gold-medallist Nanao was in fine form as he devoured Ladon Rogen of the Philippines in what turned out to be a one-sided contest.
Mandeep (69kg) defeated Ahmad Al Naboudhe of Lebanon in a lop-sided contest that had to be stopped midway due to the Indian's domination.
Manoj (64kg) won a gold medal at the 2010 Commonwealth Games and followed it up with a fine quarterfinal show at the London Olympics last year.
After getting an "all-clean" certificate from the National Anti-Doping Agency, the Beijing Olympic bronze medalist is yet to resume training. Vijender has already missed two exposure trips due to his recent controversies with drugs.
The victory was doubly sweet for the Indian camp as it helped the team bag the third position in the overall team rankings. The Indian boxers finished the Asian meet with one gold medal and three bronze medals.
Former sub-junior national champion Prayag Chauhan (60kg) continued his winning spree at the ASBC Asian Confederation Junior Boxing Championships in Shymkent, Kazakhstan, marching into the final with an easy win on Thursday.
NADA's test on blood and urine samples provided by Vijender returned negative but Punjab police says that these samples 'do not show traces of heroin or other drugs if taken from the accused after he has been clean for a week or more.'
Chauhan overpowered Nozimov Mumin of Tajikistan, Maan defeated Tsenquun Ganbold of Mongolia.
Controversial Indian boxer was under the scanner for a drug-related case. The Beijing Olympic Games medalist had been skipping training at NIS, Patiala
The event will also serve as a preparatory platform for the AIBA Junior World Championships scheduled to be held at Kiev, Ukraine in August.