Nagal outplayed Prashanth 6-1 6-1 in the all-Indian final as he broke him five times in the match.
It was the second medal for Prashanth in the tournament, having won a gold in the men's doubles with reigning singles national champion Vishnu Vardhan.
Vradhan also won two medals in the tournament as he won a silver in the mixed doubles with Prarthana Thombare, who is now focussed on doubles.
Thombare also won a silver in the women's doubles with Ankita Raina, who is country's top woman singles player.
Overall, India won five medals -- two gold and three silver medals -- from tennis.
The men's squad was coached by former national champion Ashutosh Singh while the women's team was guided by Ankita Bhambri.
Disclaimer: No Business Standard Journalist was involved in creation of this content