Bangalore-based Lahiri extended his overnight lead by two shots and take his total to 11-under-205. Kolkata's SSP Chowrasia shot the day's best score of 67 to occupy second place at seven-under-209 at the Rs 50 lakh event.
Lahiri (64-70-71), the overnight leader by two shots, started day three by converting a tricky seven-feet birdie putt on the second. He picked up another shot on the fifth to go two-under for the day.
The 26-year-old lost some momentum after missing the green and subsequently missing a five-footer for par on the eighth. The Asian Tour No. 3 came back well with an eight-feet birdie conversion on the 13th.
"The conditions were the toughest today compared to the last two days. It was windy and the tees were back. I felt I didn't have any momentum today. I just didn't have a good stretch of holes unlike previous rounds. The two bogeys didn't allow me to settle down," Lahiri said.
SSP Chowrasia (68-74-67) climbed from overnight tied ninth to second place after shooting the day's best score of five-under-67. Faridabad's Abhinav Lohan came up with a 74 in round three after his two scores of 68 to end the day in third place at six-under-210. Panchkula-based professional Angad Cheema was a further shot back in fourth place.