Tewatia started playing cricket from a very early age and made his professional debut at the first-class level by representing Haryana in the 2013–14 domestic seasons. In his debut match, he just scored 17 runs including both the innings. Besides batsman, he is also a wrist spinner and every now and then chips in with a wicket or two for his side.
After some good performance at the domestic level, he earned an IPL contract with Rajasthan Royals and in 2017 IPL player auctions, he was bought by the IPL franchise Kings XI Punjab for 25 lakhs. He was given in opportunity very late in the season but in his first match for them against KKR, his late contribution from the bat and an excellent bowling spell won them the match and kept them in the hunt for the play-offs berth.