Nanao, the reigning national champion, went up against local lad Sagaluev Bator in the title round. Sagaluev had a similar technique to Nanao and both the boxers were equally matched. But the Russian seemed to have an edge with his precise attacks.
The 22-year-old Indian tried hard to reduce the margin, but Sagaluev kept nicking crucial points to maintain the advantage. In the end, Nanao lost 8-12 and settled for a silver in the light flyweight division.
Earlier, Sunil Kumar (52kg), Shiva Thapa (56kg) and Satish Kumar (+91kg) reached the semi-final stage of the tournament to bag the bronze medal in their respective weight categories.