The experienced Dinesh Karthik guided Tamil Nadu home with a quickfire 57 off just 28 balls (nine fours and two sixers) with 32 balls to spare after the bowlers had restricted the opposition to 119 for 7 in 20 overs.
Opting to bat first, Andhra was in trouble in the very first over, losing opener Ashwin Hebbar for a duck, castled by K Vignesh. Captain G Hanuma Vihari (5) fell to Athisayaraj Davidson soon after to leave the home side at 6 for 2.
A 20-ball knock of 20 by Shoaib Mohammed Khan helped the team reach 119.
Chasing 120 for victory, Tamil Nadu saw experienced opener Abhinav Mukund become a run-out victim with 17 runs on the board.
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Dinesh Karthik, who was part of the India ODI and T20 teams in the recent series against Sri Lanka, came in at No.3 and played shots from the word go.
Though he lost M S Washington Sundar (13) with the score at 49, Karthik continued his aggressive ways and fell in the 11th over for 57.
Brief scores: Andhra Pradesh 117 for 7 in 20 overs (Ricky Bhui 25, K Vignesh 2 for 17) lost to Tamil Nadu 122 for 3 in 14.4 overs (Dinesh Karthik 57, B Aparajith 28 not out). Points: TN: 4; Andhra: 0.
Hyderabad 168 for 5 in 20 overs (Ambati Rayudu 52 not out, Akshath Reddy 34, Jalaj Saxena 2 for 28) beat Kerala 158 for 7 in 20 overs (Sachin Baby 79, Ravi Kiran 3 for 28). Points: Hyderabad: 4; Kerala: 0.