Chawrasia finished the day with a shared of the clubhouse leader after he carded an opening six-under-par 65 at Delhi Golf Club.
The double European Tour winner's round was excellent, with birdies on the 12th, 17th and 18th as well as the first, sixth and eighth holes.
He said: "I played very well and was bogey free. I made some good putts and was hitting it good off the tees. It looked easy but it wasn't! My putting was good so that's the key.
"I've played here many times so I know how to play this course. Richard (T. Lee) was playing well as well so it was fun to play with him.
"This is my National Open and all the Indian golfers enjoy playing in this event. I'm not thinking too much on the course, I'm just enjoying myself.
"All my family and friends are here so that’s nice. The winning score will be about 20-under. I’m playing well and I have good memories here.
"It wasn't very windy in the morning so that made things easier. The wind started to pick up after a few holes but I'm used to play in these conditions."