Playing for Delhi Under-19 against Meghalaya in the Cooch Behar Trophy at Shillong in November 2024, Sehwag scored 297 with 51 fours, falling three runs short of a triple century. It was the highest individual score of that edition. His father publicly congratulated him, joking that he had missed out on a Ferrari by 23 runs.
For the 2026–27 season the Delhi & District Cricket Association named him captain of the Delhi Under-19 team. In the Vinoo Mankad Trophy in October 2026 he scored 173 off 143 balls (19 fours, 8 sixes) against Chandigarh, although Delhi lost the match.
He was signed by Central Delhi Kings for the 2025 Delhi Premier League and made his debut on 27 August 2025, scoring 22 off 16 balls as an opener. In the 2026 edition he played for West Delhi Lions.
In August 2026 the junior selection committee picked him in India's Under-19 squad for the Youth ODI series against Australia in Rajkot. He scored 28, 47 and 34 in the three matches as India won the series 3–0.
At the ACC Men's Under-19 Asia Cup 2026 in Oman, he hit an unbeaten 70 off 52 balls in the opening match as India beat Nepal by 10 wickets on 6 November. On 10 November he scored 160 off 168 balls, with 17 fours and 7 sixes, against the UAE at Al Amerat; India posted 309/7, won by 70 runs and qualified for the semi-finals.
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