In November 2017, Sundar was named in India's
Twenty20 International squad for their series
against Sri Lanka. Earlier, he was also added to India's
One Day International (ODI) squad for the same series, after
Kedar Jadhav suffered a hamstring injury. He made his ODI debut for India against Sri Lanka on 13 December 2017, his first international wicket being that of
Lahiru Thirimanne. He then made his T20I debut for India against Sri Lanka on 24 December 2017. At the age of 18 years and 80 days, he became the youngest player to debut for India in T20Is. In March 2018, Sundar was selected in India's squad for the
2018 Nidahas Trophy against
Sri Lanka and
Bangladesh. He was praised by many for his economical bowling inside the powerplay at an economy of less than 6 runs an over. During the series, he bagged a maiden 3-wicket haul, making him the youngest T20I player to do so. He was named the Player of the Series for his performance. He then became a regular member of the Indian T20I team. Sundar was initially picked for
India's 2020–21 Australia tour only as a net bowler. However, injuries to fellow bowlers and the inability for India to fly in replacements at short notice due to quarantine restrictions in effect during the COVID-19 pandemic, saw him win an unexpected first
Test cap on 15 January, in the final Test match of the series at
The Gabba. His first Test wicket was
Steve Smith, and he scored 62 in his first Test innings in a crucial seventh wicket partnership of 123 with
Shardul Thakur which kept India from facing a huge first innings deficit and contributed greatly to India's eventual victory in the Test. With his maiden Test fifty, Sundar became the third Indian to score a half-century on Test debut in Australia. In October 2024, Sundar picked up his maiden
ten-wicket haul in test cricket against New Zealand. In the 4th match of the
Anderson–Tendulkar Trophy he scored his maiden test century against England. In the 2nd innings of the fifth match of the
Indian cricket team in England in 2025 he scored 53 runs taking India to a huge score of 396 on bowling friendly pitch. ==References==