After representing the country at the 2010 Under-19 World Cup in January, Kumar made his One Day International debut the following month, becoming the second-youngest player in the history of ODIs.
After last representing Canada in 2019, Kumar made his international debut for the United States national cricket team in April 2024.
[3] Kumar made his One Day International debut six months later in February 2010 against Afghanistan, becoming the second youngest ODI player.
[4] Canada's participation in the 2009–10 ICC Intercontinental Cup concluded in September 2010, when they finished bottom of the seven-team group stage.
[7] At the age of 16 years and 283 days, he became the youngest player ever to play in a World Cup when Canada lost to Zimbabwe on 28 February 2011.
[20] On 3 June 2018, he was selected to play for the Toronto Nationals in the players' draft for the inaugural edition of the Global T20 Canada tournament.
[27] In August 2019, he was named in Canada's squad for the Regional Finals of the 2018–19 ICC T20 World Cup Americas Qualifier tournament.
[29] In October 2019, he was named in Canada's squad for the 2019 ICC T20 World Cup Qualifier tournament in the United Arab Emirates.
[34] In January 2021, ahead of the 2020–21 Regional Super50 in the West Indies, Kumar joined a training camp with the Leeward Islands cricket team.