Abhinav Mukund was named Man of the Match for his 51-run knock on a tough pitch.
Tuti Patriots narrowly missed out on a playoff spot.
They had to chase the target in 18.4 overs to qualify.
Kaalai, meanwhile, tasted their second straight defeat after a run of four wins.
Dindigul Dragons ultimately folded up for 177 and Karaikudi chased it down with 6 wickets in hand.
The match boiled down to the last over as Karaikudi Kaalai needed three runs to win in the last six balls.
The ball was travelling and looked set to cross over the ropes.
There is a possibility that Karthik might get picked for the Test series in England as a backup wicketkeeper.
Badrinath’s team was earlier fined for the slow-over rate on two different occasions during the league stages.
Rohith scored an unbeaten 102 runs off 46 balls that included eight sixes and six boundaries.