Shamim's 19-under-261 total was also the lowest four-round score in a professional event at the Bombay Presidency Golf Club (BPGC).
Bengaluru's Khalin Joshi finished runner-up at 18-under-262 after a final round of 65 but also moved up to second place in the Rolex Ranking.
The 38-year-old Shamim Khan (67-66-66-62), lying overnight tied seventh and two off the lead, jumped into contention on Saturday with two early birdies on the second and third where he sank putts from 15 to 30 feet.
The pro from the Delhi Golf Club marched to his 12th title in grand style (10th on the PGTI) with two more birdies on the 16th and 18th. Khalin made a brave charge towards the end with two eagles on the 16th and 18th but just fell short of Shamim's total.
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"I knew I was in the race once I made three consecutive birdies on 10th, 11th and 12th. But I decided not to check the leaderboard till the 17th. Once I saw I was two ahead after the 17th, I went for the birdie on the 18th.
Shamim's 19-under-261 total eclipsed the previous lowest four-round score at the BPGC which was achieved by Jyoti Randhawa at the CG Open 2011 when he shot an 18-under-262.
Shamim who took home the winner's cheque worth Rs.15 lakhs has now skyrocketed from 12th position to number one in the Rolex Ranking with season's earnings of Rs. 29,84,108.
Khalin Joshi's (67-67-63-65) runner-up finish and prize purse of Rs. 10,00,000 helped him move up from fifth place to second position with season's earnings of Rs. 29,11,490.
Shubhankar Sharma (70) of Panchkula, the joint overnight leader slipped to sixth on the final day with a 13-under-267 total. Chadigarh's Sujjan Singh made a hole-in-one on the 10th during his fourth round of 67. He ended the week in tied 12th at nine-under-271. Last year's champion Ashok Kumar (71) of Delhi finished tied 24th at three-under-277.
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