From
Ikorodu, he won both sprints at the 2021 Maltina School Games and set a personal best of 10.26 seconds for the
100 metres at the second AFN All-Comers meet at Yabatech Sports Center in 2022. He competed at the
2022 World Athletics U20 Championships in
Cali, Colombia. He won a gold medal in the 100 metres at the
2023 African Athletics U20 Championships in
Ndola, Zambia. At that championships he also won a gold medal in the relay. He became Nigerian national champion in the
100 metres in June 2024. He finished fourth in the 100 metres at the
African Championships in
Douala,
Cameroon that month. At that championships, he won a silver medal in the relay. He competed in the 100 metres at the
2024 Paris Olympics, where he reached the semi-finals. He also competed in the
men's relay at the Games. He lowered his 60 metres personal best to 6.48 seconds at the
2025 NCAA Indoor Championships. It would be the first time Nigeria appears in a World Championship final since Olusoji Fasuba in
2007, where he finished fourth. In February 2026, Ajayi tied
Christian Coleman's collegiate record for the 60 metres, running 6.45 seconds to win the SEC Indoor Championships ahead of
Jelani Watkins. On 14 March, he ran 6.45 seconds again to equal his African record and win the
2026 NCAA Indoor Championships in Fayetteville ahead of
Jelani Watkins.{{Cite web | url= https://worldathletics.org/news/report/kaalund-tharp-ncaa-indoor-championships|date=14 March 2026 ==Personal life==