Pinnock won the collegiate long jump double in 2022, winning the NCAA Indoor and NCAA Outdoor titles.[3] That year, he made his senior major championship debut at the 2022 World Championships in Eugene, Oregon, placing ninth overall.[4]
With his first jump at the 2023 World Athletics Championships in Budapest in August 2023, Pinnock achieved a new personal best distance of 8.54 metres, and it was enough for him to win the silver medal at the event.[5][6]
He won the long jump NCAA Indoor Championships in March 2024 in Boston, Massachusetts ahead of Jeremiah Davis.[7][8] With his effort of 8.40 metres, he equalled the Jamaican indoor record, matching the mark achieved previously by James Beckford and Carey McLeod.[9] He won the long jump at the SEC Championship in Gainesville, Florida on 10 May 2024.[10]
In June 2024, he placed second at the Jamaican Athletics Championships long jump with a leap of 8.27 metres.[11] Selected as part of the Jamaican team for the 2024 Summer Olympics in Paris, he won the silver medal with a jump of 8.36 metres.[12][13]
He was named in the Jamaican team for the 2025 World Athletics Indoor Championships in Nanjing in March 2025, where he won another global competition silver medal with a season's best 8.29 metres, 1 cm behind winner Mattia Furlani, and 1 cm ahead of Australian bronze medalist Liam Adcock.[14][15]
He won the 2025 London Athletics Meet, part of the 2025 Diamond League with a jump of 8.20 metres, 1 centimetre ahead of second place Miltiadis Tentoglou.[16] He placed fourth at the Diamond League Final in Zurich on 28 August.[17]
In 2025, he was one of a number of Jamaican athletes including Jaydon Hibbert, Roje Stona and Rajindra Campbell who were reportedly incentivised to change their international allegiance to European country Turkey. As a result, the athletes did not compete at the 2025 World Athletics Championships.[18] Önder Özbilen, the team coordinator for Turkey's Olympic athletics team, confirmed the decision in March 2026.[19] The applications were declined by World Athletics in April 2026 as "inconsistent with the core principles of the regulations".[20][21]
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