The Abhinav Mukund-led side always had the upper hand in the five-day encounter after bundling out Tamil Nadu for 134 in the first innings and then amassing 762 runs courtesy a triple century by middle-order batsman Karun Nair (338).
     
Chasing an imposing 628, Tamil Nadu were shot out for 411 in 107.5 overs in the final session of the fifth day's play.
     
Starting the day on 113 for three, Tamil Nadu saw resilient centuries from Vijay Shankar (103) and Dinesh Karthik (120) but the writing was on the wall after their departure.
     
Leg-spinner Shreyas Gopal (4-126) wrecked the Tamil Nadu batting order with his four scalps. Skipper R Vinay Kumar, who became the joint leading wicket taker this season, ended with two wickets, along with Sreenath Aravind.
     
But the real hero for Karnataka was the 23-year-old Nair, who deservedly got the man-of the-match award for his maiden triple ton in first-class cricket.
     
The innings also saw centuries from Lokesh Rahul (188) and R Vinay Kumar (105 not out) as Karnataka did enough to bat just once.
     
For Tamil Nadu, wicketkeeper-batsman Karthik notched up his 23rd first class century and his 112-ball knock laced with 21 fours and a six, while Shankar made a fluent 103 (164b, 18x4).
     
Earlier, overnight batsman Baba Aparajith (68) and Vijay Shankar looked poised for a big score, as they batted sensibly. Tamil Nadu however lost Aparajith in the 21st over of the day thanks to a0 brilliant catch from wicketkeeper Robin Uthappa behind the stumps to get rid off him.
     
The 20-year old added 32 runs to his overnight score of 36 and his 227 minutes at the crease produced 11 fours. He 0forged a 112-run stand with Vijay Shankar for the fourth wicket.
     
His departure brought Karthik to the crease, who set an aggressive tone to the Tamil Nadu innings only witness a sorry end to a brave campaign.

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