A fighting knock of 81 not out by Baba Aparajith and a half century by M Kaushik Gandhi helped Tamil Nadu post 218 for 7 on the opening day against Bengal in the Elite Group B match.
Batting first after winning the toss, the home team got off to a slow start with openers Gandhi and Abhinav Mukund negotiating the Bengal new ball attack cautiously.
However, Mukund fell for 9 to a catch by Kousik Ghosh off Ishan Porel's bowling.
Aparajith, who joined Gandhi added 73 runs as Tamil Nadu looked to consolidate.
Bengal struck two quick blows, dismissing Gandhi (51) and captain B Indrajith (0).
Jagadeesan and Aparajith put on a half century partnership to steady Tamil Nadu.
Aparajith held firm even as wickets fell around him to see the day through.
The talented young Porel was the best bowler for Bengal with three wickets.