ONGC, unbeaten in the series so far, outplayed Tamil Nadu 78-63 at the Don Bosco school courts in Matunga today.
In a precursor to the final, ONGC eked out a fighting two-point win over former NBA players team Sportspower, USA (83-81) to get the much needed psychological advantage.
However, ONGC will miss the services of sharpshooter Trideep Rai, who was stretchered out with an ankle injury.
In the women's section, Maharashtra and defending champions Southern Railway will battle it out at the finals.
Maharashtra came up with another clinical performance to down Chhattisgarh 76-66, for their third consecutive win.
Scores: Women: Maharashtra 76 (Renu Maurya 18, Manisha
Dange 16) bt Chhattisgarh 66 (M Pushpa 24, Poona Chaturvedi 14). HT 50-49.
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Men: ONGC 78 (Amritpal Singh 22, Yadwinder Singh 21, Vishesh Brighuvanshi 19) bt Tamil nadu 63 (Amjyot Singh 20, C V Dinesh 12).
ONGC 83 (Vishesh Brighuvanshi 27, Amritpal Singh 19) bt Sportspower (USA) 81 (Terrance Thomas 23, Anthony Bonner 17, Jim Bartalotta 16) HT 43-37.