 On 6 October 2018, in the first test against West Indies he took his first five-wicket haul in Tests.After an impressive showing against Australia, in the "T20I series" of India tour of Australia 2018/19, Kuldeep jumped 20 places to claim a career-best third position in the MRF ICC T20I Bowlers Rankings, updated on 26 November 2018.On 6 January 2019, in the fourth Test against Australia at the SCG and in his first Test match on Australian soil, he took his second five-wicket haul (5/99) in Tests, in Australia's first innings.