Thammasin, who had knocked out former national champion and top seed Sourabh Verma in the opening round, went on to scalp Sen 15-21 21-14 21-19 in a well-contested men's singles final that lasted 80 minutes at the Cricket Club of India.
Earlier, in a largely one-sided all-India women's final eighth seed Ruthvika Shivani Gudde outsmarted unseeded compatriot Riya Mukherjee 21-12 23-21 in 40 minutes.
Almora-born Sen, a protegee of Prakash Padukone academy in Bengaluru, came out second-best to the Thai opponent in the last two games in smash power and net duels.
The world no. 3 junior, who won the India International Series 2017 in Hyderabad last week, took control of the opening game from 13-12 with a string of smash winners and drops even as the Thai found his smashes bulging the net.
In the last game, the two opponents went neck to neck till 18-all when Sen, who faltered in a tight net dribble to fall behind, was beaten by a powerful smash by the Thai who went to match-point.
The Indian retrieved the serve to narrow it down to 19-20 but then was drawn close to the net by the Thai who finished off the match with yet another smash to mid-court.
In the first game, neither player could take a lead of more than one point till it was 10-all when Ruthvika hit a purple patch and reeled off seven points in a row. That surge helped her wrap up the game in just 15 minutes with a drop that was netted by Riya.
Ruthvika, whose global ranking has dipped from 48 at the beginning of last year to 119 due to a six-month injury-forced lay-off, led 10-7 in the second when Riya bounced back.
Riya had another game point at 21-20 but couldn't wrap up the game. Ruthvika won the next two points to hold her first match point which she made count with a smash winner from close to the net.
Results (all finals):
Women's singles: 8-Ruthvika Shivani Gadde (India) bt Riya Mukherjee (India) 21-12 23-21.
Women's doubles: 2-Ng Tsz Yau/Yeung Nga Ting (Hong Kong) bt Ng Wing Yung/Yuen Sin Ying (Hong Kong) 23-25 21-14 21-19.
Men's doubles: Maneepong Jongjit/Nanthakarn Yordphaisong (Thailand) bt Aaron Chia/Wooi Yik Soh (Malaysia) 21-6 21-9.
Mixed doubles: Hee Chun Mak/Yeung Nga Ting (Hong Kong) bt Chang Tak Ching/Ng Wing Yung (Hong Kong) 21-11 17-21 21-18.
Disclaimer: No Business Standard Journalist was involved in creation of this content
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