The World Athletics U20 Championships is a biennial world championships for the sport of athletics organised by the World Athletics, contested by athletes in the under-20 athletics age category (19 years old or younger on 31 December in the year of the competition.
Aron Kifle Teklu is an Eritrean long-distance runner. He competed in the 5000 metres at the 2015 World Championships in Beijing, narrowly missing the final.
Selemon Barega Shirtaga is an Ethiopian long-distance runner who competes primarily in the 5000 metres and 10,000 meters. He won the gold medal at the 10,000 m at the 2020 Tokyo Summer Olympics. He represented his country at the 2017 World Championships finishing fifth in the final. He also won gold medals at the 2016 World U20 Championships and 2017 World U18 Championships. He won a silver medal in the men's 5000 metres at the 2019 World Athletics Championships in Doha, Qatar.
Oscar Chelimo is a Ugandan long-distance runner. His older brother, Jacob Kiplimo is also an elite long-distance runner.
Cameron "Cam" Corbishley is a British race walker. He specialises in the 20km and 50km walks.
The men's shot put at the 2021 World Athletics U20 Championships was held at the Kasarani Stadium on 18 and 19 August.
The men's hammer throw at the 2021 World Athletics U20 Championships was held at the Kasarani Stadium on 18 and 20 August.
The men's 800 metres at the 2021 World Athletics U20 Championships was held at the Kasarani Stadium on 19, 21 and 22 August.
The men's 400 metres hurdles at the 2021 World Athletics U20 Championships was held at the Kasarani Stadium on 19, 21 and 22 August.
The men's javelin throw at the 2021 World Athletics U20 Championships was held at the Kasarani Stadium on 18 and 20 August.
The men's 100 metres at the 2021 World Athletics U20 Championships was held at the Kasarani Stadium on 18 and 19 August.
The men's 1500 metres at the 2021 World Athletics U20 Championships will be held at the Kasarani Stadium on 19 and 21 August.
The men's 400 metres at the 2021 World Athletics U20 Championships was held at the Kasarani Stadium 18 and 21 August.
The women's 5000 metres at the 2021 World Athletics U20 Championships was held at the Kasarani Stadium on 22 August.
