Gursimar shot one-over 72 to get to a total of 5-over 218 and win by three strokes over Neha Tripathi (75) at the Poona Club Golf Course.
Gursimar and Neha had shared the lead after the second day but the former ensured fewer mistakes and a far more steady round than all others in the field.
Gursimar's round of 72 was by far the best of the day. The next best card came from Neha, who shot 75 and ended at 8 -over 221.
Tvesa Malik (77), who was third behind Gursimar and Neha, was nine shots behind the winner, Gursimar.
Ayesha Kapur (77) was fourth at 229 with Saaniya Sharma (81) finishing fifth at 230.
Gurimsar, who won two titles and finished fourth on the Hero WPGT Order of Merit last season, opened with three pars and had a bogey on fourth and another on seventh, which was followed by a birdie on ninth. As Gursimar turned in one-over 37, she was still in the lead as Neha had dropped behind by carding two-over 38 in the opening nine.
Gursimar did stumble with bogeys on 15th and 16th but so did her playing partner and overnight co-leader, Neha, who also dropped shots on the same holes. Overall Neha had five bogeys against one birdie in her 75.
With the rest of the field more or less out of reckoning soon after the turn, Tvesa, Ayesha and Saaniya finished third to fifth.
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