Chopra posted a 67 to lead on 12-under-par 202 total at the end of the third day's play. Chopra only needed 24 putts at the Springfield Royal Golf Club in Thailand on Friday.
He said: "I didn't play as well as I did the first two days from tee to green but my putter was amazing today. It was almost perfect. I made everything I needed to make. I hit a lot of good shots and I also hit a lot of bad shots which was strange but I managed to save them with my short game.
"I am happy with how I stand right now. I gave myself a good cushion to get my card but you never know what will happen. Today was a bit shaky but I still managed to come through and put the score up there.
"It will be great if I can top the class but if the plan didn't work as well tomorrow, I will have to at least try and get my card."