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The social media too heaped praise on the India wicketkeeper-batsman who brought a breath of fresh air into a commentary box full of doyens.
"Actually, I was the only debutant of that final," Karthik said with a chuckle.
While the Indian team went on a 20-day break after the final, Karthik moved on to his next assignment -- the limited overs series between Sri Lanka and England.
He will also be commentating during the five-match Test series between India and England before heading to the UAE to play for Kolkata Knight Riders in the IPL.
After the IPL had to be suspended in May due to the COVID-19 pandemic, commentary just happened for Karthik, who had done some punditry for Sky Sports during India's home series against England in February-March.
"I did that and it went pretty well. That is when I got the opportunity to do commentary and I decided to go for it. The mind set was just to speak about whatever little I know about the game," he said rather modestly having played more than 150 games for India across formats.
On the stereotype that commentary is a thing for the former players, Karthik said: "There are a lot of other sports like basketball and football where current players come on air when they are not playing.
"Even now during the Sri Lanka-England T20s, James Anderson was doing it for BBC in the next room. So it is a normal thing, it is only in India I think it is considered like that (post-retirement option).
"I obviously want to break that stererotype to an extent and I am happy to do this when I am not playing."
Before making his commentary debut, Karthik got to spend a lot of time with Sunil Gavaskar in Serbia, a country they were in for 10 days before entering the UK amid the pandemic.
"I am extremely lucky that it happened. He gave me a few tips (on commentating) and it went well. More than the tips, the time I spent with him was very enlightening and enriching.