Chadha brought in a card of three-under-69 in the final round to end the week with a total of 16-under-272 at the Classic Golf & Country Club.
Ajeetesh Sandhu, another Chandigarh golfer, who shot the day's best of six-under-66, finished tied second along with Om Prakash Chouhan of Mhow at 11-under-277 at the Rs. 1 crore event.
Chadha pocketed a cheque worth Rs. 15 lakh for his win this week that helped him climb from 30th place to number one position in the Rolex Rankings. He now has total earnings of Rs. 17,91,165 for the 2015 PGTI season. Veteran Mukesh Kumar of Mhow is placed second at Rs. 17,40,350.
Chadha, well clear of the rest of the field over the first eight, began to gather steam with birdies on the ninth and 10th where he hit a couple of outstanding approach shots.
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Abhijit, who won his last title on the PGTI in 2012 in Nepal, started pulling away from the rest as he produced some top-class chip-putt birdies on the 12th, 14th and 15th. The three-putt bogey on the 13th came against the run of play. He then went on to register a comfortable win despite a closing bogey on the 18th.
He added, "Last week also I was leading going into the final round but I couldn't capitalise on it as I had a poor last day of the tournament. I knew I was playing well but nothing really worked for me in round four in Jaipur. However, I put that behind me and didn't let it affect me this week.
Ajeetesh Sandhu (73-72-66-66) fired a second straight 66 to leapfrog from overnight tied 11th to tied second in the final round. Ajeetesh made seven birdies and a bogey in his last round effort which included birdies on the last three holes.