He was one shot clear of the in-form defending champion Scott Hend of Australia.
After eight birdies, four on either side of the course, Lahiri capped it all by draining a 15-foot eagle putt on the 18th hole. It was a career low round and it also bettered his last year's record-equaling 62 in the final round, which saw him finish runner-up.
A total of 14 Indians teed up this week as Arjun Atwal, Angad Cheema, M Dharma and Himmat Rai carded 70 each to be tied 34th, while Jeev Milkha Singh shot 71 to be tied 60th. Shiv Kapur and Rahil Gangjee had a tough time with 73 each in tied 93rd spot, Sujjan Singh (74) was tied 101st. S Chikkarangappa (75) may have given Lahiri good advise but he himself struggled to be tied 120th while Rashid Khan retired.
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"It's a great Diwali and happy Diwali to everyone back home. It's nice to have some fireworks on the course," smiled Lahiri, who needed only 22 putts for his round.
"It's fantastic. I really played solid all day and it was nice to get such fantastic weather and putt well. I think I did really well inside of 15 feet. This is the best I've putted for a while. My good friend S Chikka who is playing this week pointed something out and he knows my game really well.