The host trailed by one point after the first quarter but bounced back well to march ahead.
Justin Gnanaraj was the top-scorer for Tamil Nadu, with 17 points.
NBA player Satnam Singh was in fine fettle, scoring 26 points for Punjab.
Earlier in the day, defending champion Kerala defeated Chhattisgarh 76-62 today in a women's Group 'A' match.
The fancied Kerala women, who had suffered a reverse at the hands of Karnataka yesterday, faced stiff resistance from the Chhattisgarh girls.
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Though their rivals tried hard, they couldn't quite bridge the gap and went down by six points.
The formidable Railways team crushed Rajasthan 91-38 in a Group 'B' encounter with Madhu Kumari logging 24 points.
Karnataka women, who shocked Kerala yesterday, continued the good run, beating Madhya Pradesh 79-68.
They hit back strongly after conceding a small lead in the first quarter and won rather comfortably.
In a Group 'B' game,Delhi overcame a deficit in the first quarter to post a 73-53 over Maharashtra, dominating towards the end of the match.
In a men's Group A fixture, Rajasthan and Odisha were involved in a close tussle, before the former prevailed 85-71 with an impressive performance in the final quarter.
Later in a Group 'B' match, a strong Indian Railways team held off Gujarat's challenge to win 74-65.
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