Lahiri, starting the day just outside the Top-10 carded 67-67-70-64 for 12-under 268 and the result was his best since the win at the Hero Indian Open in February this year. Lahiri was five shots behind the winner.
SSP Chawrasia needing a good finish to seal his 2016 European Tour card had a disappointing finish after making a great charge on the back nine. He was lying four-under for the day with two holes to go and in tied-10th place. But he bogeyed 17th and double bogeyed 18th and finished tied 24th alongside Shiv Kapur (67) at five-under 275.
Danny Willett (65) made up for the disappointment of the weekend at the Open, where he finished in a tie for sixth after being in contention. He held off stiff competition from fellow Englishmen Matt Fitzpatrick (66) and Tyrrell Hatton (62) to win the title and clinch his third European Tour International Schedule victory.
Willett, the overnight co-leader carded a bogey free 65 on Sunday to finish the tournament on 17 under par, one shot ahead of Fitzpatrick, with Tyrrell Hatton two shots further back on 15 under.
He added, "It's good to finish with a 64 as I did the exact same thing with a 64 last year too. The experience of being here many times showed especially on the greens. There were some tricky pins, which I've seen before and having been here a few times, you now know where to hit it, how it's going to break and that made a massive difference.