In 2013, athletics coach Brother Colm O’Connell, who was also based in Iten in Kenya, convinced Emmanuel Korir to switch from shorter sprints to the 400 metres.

[5] The same year, he left the UTEP for a professional running contract with Nike, Inc.[6] In 2017 and 2019, he failed to make the 800 metres finals at the World Athletics Championships, securing the silver medal in the event at the 2018 African Championships in Athletics.

[1] Korir qualified to represent Kenya at the 2020 Tokyo Olympics,[7] where he won the gold medal in the 800 m event with a time of 1:45.06.

[8] He completed the Olympic-world double at the 2022 World Athletics Championships held in Eugene, Oregon, claiming 800 m title in a season's best of 1:43.71.

[9][10] At the Commonwealth Games in Birmingham the following month, he was disqualified for a lane infringement in the men's 400 metres heats.