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The men's 4×100 metres relay at the 2004 Summer Olympics as part of the athletics program was held at the Athens Olympic Stadium from August 27 to 28. The sixteen teams competed in a two-heat qualifying round in which the first three teams from each heat, together with the next two fastest teams, were given a place in the final race.
The women's 4×100 metres relay at the 2004 Summer Olympics as part of the athletics program was held at the Athens Olympic Stadium from August 26 to 27. The sixteen teams competed in a two-heat qualifying round in which the first three teams from each heat, together with the next two fastest teams, were given a place in the final race.
The men's 4×400 metres relay at the 2004 Summer Olympics as part of the athletics program was held at the Athens Olympic Stadium from August 27 to 28. The sixteen teams competed in a two-heat qualifying round in which the first three teams from each heat, together with the next two fastest teams, were given a place in the final race.
Mauritania competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. The country's participation at Athens marked its sixth appearance in the Summer Olympics since its debut in the 1984 Summer Olympics. The delegation included two track and field athletes, Youba Hmeida and Aminata Kamissoko, who were both selected by wildcards after both failed to meet either the "A" or "B" qualifying standards. Hmeida was selected as the flag bearer for the opening ceremony. Neither of the Mauritanians progressed beyond the heats.
The men's 110 metres hurdles competition at the 2012 Summer Olympics in London, United Kingdom was held at the Olympic Stadium on 7–8 August. Fifty-three athletes from 33 nations competed. The event was won by Aries Merritt of the United States, the nation's first championship in the event since 1996 and 19th overall. Hansle Parchment's bronze was Jamaica's first medal in the men's high hurdles.
For the athletics competitions at the 2012 Summer Olympics the following qualification systems were in place. The list has been updated to 30 June 2012. Qualification ended on 8 July 2012.
For the swimming competitions at the 2016 Summer Olympics, the following qualification systems were in place. Qualification ended on 3 July 2016.
For the athletics competitions at the 2016 Summer Olympics, the following qualification systems were in place. Qualification ended on 11 July 2016.
For the athletics competitions at the 2008 Summer Olympics, the following qualification systems were in place.
For the athletics competitions at the 2000 Summer Olympics, the following qualification systems were in place.
For the swimming competitions at the 2020 Summer Olympics, the following qualification systems are in place. As the Olympics was postponed to 2021 due to the COVID-19 pandemic, qualification ends on 27 June 2021.
For the athletics at the 2020 Summer Olympics competitions, the following qualification systems are in place. Qualification ended on 29 June 2021, but for marathon and 50 km race walking, it already ended on 31 May 2021. Some 1900 athletes, from 196 countries, will compete. 103 countries are qualified also through Universality places.
The men's 100 metres event at the 2020 Summer Olympics took place on 31 July and 1 August 2021 at the Olympic Stadium. 84 athletes were expected to compete; 27 nations used universality places to enter athletes in addition to the 56 qualifying through standard time or ranking. 78 athletes from 59 nations competed. Marcell Jacobs won the gold medal, establishing twice, semifinal and final, the new European record, Italy's first medal in the men's 100 metres. The United States extended its podium streak in the event to six Games with Fred Kerley's silver, only third at the US Trials. Canadian Andre De Grasse won his second consecutive bronze medal in the 100 metres establishing his personal best. With Usain Bolt retired, Jamaica's three-Games gold medal streak ended.
The men's 50 kilometres walk event at the 2020 Summer Olympics took place on 6 August 2021 in Sapporo. 59 athletes competed; the exact number was dependent on how many nations use universality places to enter athletes in addition to the number qualifying through time.
The men's 4 × 100 metres relay event at the 2020 Summer Olympics took place on 5 and 6 August 2021 at the Olympic Stadium. There were 16 competing relay teams, with each team having 5 members from which 4 were selected in each round.
The women's 4 × 100 metres relay event at the 2020 Summer Olympics took place on 5 and 6 August 2021 at the Japan National Stadium. There were 16 competing relay teams, with each team having 5 members from which 4 were selected in each round.
The men's 4 × 400 metres relay event at the 2020 Summer Olympics took place on 6 and 7 August 2021 at the Japan National Stadium. There were 16 competing relay teams, with each team having 5 members from which 4 were selected in each round.
The women's 4 × 400 metres relay event at the 2020 Summer Olympics took place on 5 and 7 August 2021 at the Japan National Stadium. There were 16 competing relay teams, with each team having 5 members from which 4 were selected in each round.
The mixed 4 × 400 metres relay event at the 2020 Summer Olympics took place on 30 and 31 July 2021 at the Japan National Stadium. There were 16 competing relay teams, with each team having 4 members. It was the first mixed-gender relay in athletics held at the Olympics Games, as part of a larger focus on gender equality by the International Olympic Committee.
These are the qualification rules and the quota allocation for the snowboarding events at the 2022 Winter Olympics.