The World Athletics Relays, known as the IAAF World Relays until 2019, is an international biennial track and field sporting event held by World Athletics where teams from around the world compete in relay races, some of which are not part of the standard Olympic programme. The first three editions were set to take place in Nassau, Bahamas at the Thomas Robinson Stadium in 2014, 2015 and 2017. Originally intended as an annual event, it was later decided to happen every odd year, the same as the IAAF World Championships in Athletics for which it serves as a qualification stage.
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.
Alessandro Sibilio is an Italian 400 metres hurdles and 400 metres dash, who won a gold medal at the 2018 IAAF World U20 Championships. He competed at the 2020 Summer Olympics, in 400 m hurdles.
Sasha Zhoya is an athlete who represents France in international track and field competition. Born in Australia, and of French and Zimbabwean descent, he represents France internationally.
Kenneth Selmon is an American track and field athlete who specializes in the 400 metres hurdles. He won the USA Outdoor Championship in 2018 and represented his country at the 2018 Athletics World Cup in London, where he won the 400 metres hurdles.
Sean Burrell is an American athlete who has competed in the 200m, 400m and 400m hurdles.
Cyréna Samba-Mayela (born 31 October 2000, Champigny-sur-Marne is a French athlete who competes in the 60m and 100m hurdles.
Viivi Lehikoinen is a Finnish athlete. She competed in the women's 400 metres hurdles event at the 2020 Summer Olympics.
The Mixed 4 × 400 metres relay at the 2021 IAAF World U20 Championships was held at the Kasarani Stadium on 18 August.
The women's 400 metres hurdles at the 2021 World Athletics U20 Championships was held at the Kasarani Stadium on 19 and 22 August.
The women's heptathlon at the 2021 World Athletics U20 Championships was held at the Kasarani Stadium on 18 and 19 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 women's 400 metres at the 2021 World Athletics U20 Championships was held at the Kasarani Stadium 18 and 21 August.
The men's 110 metres hurdles at the 2021 World Athletics U20 Championships was held at the Kasarani Stadium on 20 and 21 August.
The women's 100 metres hurdles at the 2021 World Athletics U20 Championships was held at the Kasarani Stadium on 20 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 men's decathlon at the 2021 World Athletics U20 Championships was held at the Kasarani Stadium on 20 and 21 August.
The women's 4 × 400 metres relay at the 2021 World Athletics U20 Championships was held at the Kasarani Stadium on 22 August.
The men's 4 × 400 metres relay at the 2021 World Athletics U20 Championships was held at the Kasarani Stadium on 21 and 22 August.
