Ian Lowell Crocker is an American former competition swimmer, five-time Olympic medalist, and former world record-holder. During his career, he set world records in the 50- and 100-meter butterfly and the 100-meter freestyle. He has won a total of twenty-one medals in major international competition, spanning the Olympics, the FINA World Aquatics Championships, and the Pan Pacific Swimming Championships. He coached for many years at the Western Hills Athletic Club and has helped coach the Longhorns swim camp in 2019 as well as other years. Since Spring of 2022 when the new facility opened, Crocker coaches at the Western Aquatics and Social Club at the Eanes Independent School District Aquatics center.
Ryan Steven Lochte is an American professional swimmer and 12-time Olympic medalist. Along with Natalie Coughlin, Dara Torres, and Jenny Thompson, he is the second-most decorated swimmer in Olympic history measured by total number of medals, behind only Michael Phelps. Lochte's seven individual Olympic medals rank second in history in men's swimming, tied for second among all Olympic swimmers. He currently holds the world records in the 200-meter individual medley. As part of the American teams, he also holds the world record in the 4×200-meter freestyle and 4×100-meter freestyle (mixed) relay.
Nathan Ghar-jun Adrian is an American competitive swimmer and five-time Olympic gold medalist who formerly held the American record in the long course 50-meter freestyle event.
This article includes the world record progression for the 4×100 metres medley relay, and it shows the chronological history of world record times in that competitive swimming event. The 4×100 metres medley relay is a medley race in which each of four swimmers on a team swims a 100-metre leg of the relay, each swimming a different stroke, in the following sequence:
- Backstroke ;
- Breaststroke;
- Butterfly;
- Freestyle.
Michael Fred Phelps II is an American former competitive swimmer. He is the most successful and most decorated Olympian of all time with a total of 28 medals. Phelps also holds the all-time records for Olympic gold medals (23), Olympic gold medals in individual events (13), and Olympic medals in individual events (16). At the 2004 Summer Olympics in Athens, Phelps tied the record of eight medals of any color at a single Games, held by gymnast Alexander Dityatin, by winning six gold and two bronze medals. Four years later, when he won eight gold medals at the 2008 Beijing Games, he broke fellow American swimmer Mark Spitz's 1972 record of seven first-place finishes at any single Olympic Games. At the 2012 Summer Olympics in London, Phelps won four gold and two silver medals, and at the 2016 Summer Olympics in Rio de Janeiro, he won five gold medals and one silver. This made him the most successful athlete of the Games for the fourth Olympics in a row.
The men's 100 metre freestyle event in swimming at the 2013 World Aquatics Championships took place on 31 July and 1 August at the Palau Sant Jordi in Barcelona, Spain.
The men's 100 metre backstroke event in swimming at the 2013 World Aquatics Championships took place on 29–30 July at the Palau Sant Jordi in Barcelona, Spain.
The men's 200 metre backstroke event in swimming at the 2013 World Aquatics Championships took place on 1–2 August July at the Palau Sant Jordi in Barcelona, Spain.
The men's 50 metre breaststroke event in swimming at the 2013 World Aquatics Championships took place on 30–31 July at the Palau Sant Jordi in Barcelona, Spain.
The men's 100 metre butterfly event in swimming at the 2013 World Aquatics Championships took place on 2–3 August at the Palau Sant Jordi in Barcelona, Spain.
The men's 200 metre butterfly event in swimming at the 2013 World Aquatics Championships took place on 30–31 July at the Palau Sant Jordi in Barcelona, Spain.
The men's 4 × 100 metre freestyle relay event in swimming at the 2013 World Aquatics Championships took place on 28 July at the Palau Sant Jordi in Barcelona, Spain.
The men's 4 × 200 metre freestyle relay event in swimming at the 2013 World Aquatics Championships took place on 2 August at the Palau Sant Jordi in Barcelona, Spain.
The men's 4 × 100 metre medley relay event in swimming at the 2013 World Aquatics Championships took place on 4 August at the Palau Sant Jordi in Barcelona, Spain.
The women's 50 metre freestyle event in swimming at the 2013 World Aquatics Championships took place on 3–4 August at the Palau Sant Jordi in Barcelona, Spain.
The women's 200 metre backstroke event in swimming at the 2013 World Aquatics Championships took place on 2–3 August at the Palau Sant Jordi in Barcelona, Spain.
The women's 400 metre individual medley event in swimming at the 2013 World Aquatics Championships took place on 4 August at the Palau Sant Jordi in Barcelona, Spain.
Chase Tyler Kalisz is an American swimmer who specializes in individual medley events. He is an Olympic gold medalist in the 400-meter individual medley at the 2020 Summer Olympics in Tokyo, an Olympic silver medalist at the 2016 Summer Olympics in Rio de Janeiro and a two-time World Aquatics Championships gold medalist.
The men's 4 × 200 metre freestyle relay event at the 2020 Summer Olympics was held on 27 and 28 July 2021 at the Tokyo Aquatics Centre. It will be the event's twenty-sixth consecutive appearance, having been held at every edition since 1908.
