Tom Latham (103) and Ross Taylor (95) added 200 runs in New Zealand's successful 281-run chase during which the spin twins hardly troubled the duo.
"These are the kind of games which makes you mentally tougher as a bowler. These are the kind of games which are going to help them to stand up to pressure and learn how to handle pressure when the wicket is not so much helping them," Karthik said at the post-match media conference.
"The team management backed them a lot and they believe in themselves. They are two young guys and they have produced some fantastic spells in the last series and I am sure their confidence is sky high. One game here and there, doesn't not make you a bad bowler," said Karthik.
Like his skipper Virat Kohli, the Tamil Nadu batsman was full of praise for Taylor and Latham, who stood out in testing conditions scripting a near flawless run-chase.
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Karthik, who looked good during his knock of 37 off 47 deliveries admitted that he should have converted the start.
"There are two ways to look at it. It was a decent start. Having said that, a player like me should have tried and batted a little longer. And that is something, I am disappointed about.
"I could have batted a little more and we would have probably ended up getting 15-20 runs more towards the end. May be, I got out at a critical time in the game. So pretty disappointed with that aspect but it was decent start and good to have that partnership with Virat," Karthik added.
"Look initially, I think the wicket was very sticky and it wasn't easy. A lot of balls going uppish in the air and it was very hard to drive. It was not coming onto to the bat. It looked like two different wickets (during two innings).
"To be really honest, it was not easy to score runs, the ball going left and right of mid off and covers and in the air, we were not able to time the ball as well.
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