Shankar, who honed his skills at the RCGC, held his nerves in front of a boisterous home crowd to come up with a four-day aggregate of 16-under 272 to register the biggest win of his career.
Kapurthala's Gaganjeet Bhullar and Abhinav Lohan of the DLF Golf & Country Club, Gurgaon, were joint runners-up at 13-under-275 as they fired matching scores of 68 in round four.
"I knew I could not go wrong from here at my home course. From there on, I tried to be simple by playing in the greens," the ever-smiling Shankar told reporters.
The three-putt bogey on the 11th did not dampen Shankar's spirits as he hit an outstanding tee shot on the par-3 13th and thereafter sank a 12-footer for birdie.
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Shankar was once again seemed unfazed after the dropped shot on the 14th as he came back stronger with birdies on the 15th and 16th, thanks to some excellent wedge shots.
Das pocketed a handsome pay cheque of Rs 2,377,500, the highest ever for a domestic tournament in India en route to the Order of Merit title.
"This is definitely the biggest win of my career. It's helped me become number one on the PGTI for the first time. I want to thank (my sponsor) Dilip Thomas Sir who has supported me all along," he said.
Dedicating the win to his ailing mother Aruna, he said: "It's been a tough time for my family this year. I missed about four tournaments midway through the season due to my mother's back surgery.