Aditi, whose earlier rounds were 68, 70 and 73 totalled 10-under 278.
It was a fine finish for Aditi, who took three weeks off before returning to the competition. On Sunday, she devoured all three par-5s, just as she had done a day earlier.
In the final round, she had six birdies -- first, second, fifth, seventh, 10th and 11th -- and dropped her only shot on 14th for a 67, which also fetched her USD 16,830.
Lewis fired a 3-under-par 69 on Sunday to get to 20-under and as announced she will donate the whole of her winner's check of USD 195,000 to the relief efforts in her adopted hometown of Houston, Texas.
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In Gee Chun (66) finished at 19-under, while Brittany Altomare (69) and Thai Moriya Jutanugarn (72) were 14-under and tied for third.
It was In Gee Chun's fifth runner-up finish of 2017.
Mirim Lee, Gerina Piller, Chella Choi, and Ai Miyazato finished a shot further back at 13-under par, and tied for fifth. It was Miyazato's final round on US soil prior to her retirement from the LPGA Tour.
The LPGA Tour heads to Indiana next week for the inaugural Indy Women in Tech Championship prior to The Evian Championship, the final major of the LPGA Tour season.
Lewis has a strong connection with Houston, where her husband is the head women's golf coach at the University of Houston, and Lewis herself moved to the town when she was 11. The town was recently devastated by Hurricane Harvey.
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