Brendan Joseph Hansen is an American former competition swimmer who specialized in breaststroke events. Hansen is a six-time Olympic medalist, and is also a former world record-holder in both the 100-meter and 200-meter breaststroke events.
Jessica Tatiana Long is a Russian-American Paralympic swimmer from Baltimore, Maryland, who competes in the S8, SB7 and SM8 category events. She has held many world records and competed at five Paralympic Games, winning 29 medals. She has also won over 50 world championship medals.
Erica Rachelle Morningstar is a Canadian swimmer who has competed in international events including the 2008 Summer Olympics, and 2012 Summer Olympics.
Seth Van Neerden is a former national record-holding swimmer and national team member from the United States. He competed at the 1995 Pan American Games, where he won three gold medals: as part of the American team's winning 4×100-meter medley relay, and for winning the 100- and 200-meter breaststroke events. He received a bronze medal at the 1993 FINA Short Course World Championships.
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.
Guilherme Augusto Guido is a Brazilian backstroke swimmer who specializes in sprint events. He was twice a finalist in the 100 metre backstroke at World Championships
Kenneth King-him To was a Hong Kong Australian swimmer who practised individual medley, freestyle, butterfly and breaststroke. He won 6 medals at the 2010 Summer Youth Olympics, was the male overall winner of the 2012 FINA Swimming World Cup and was a World Championships silver medallist. He was the holder of 16 Hong Kong national swimming records.
Marcelo Chierighini is a Brazilian competitive swimmer. In the 100 metre freestyle, he was an Olympic finalist at the Rio 2016 Games, and four times in a row a finalist at the World Championships in 2013, 2015, 2017 and 2019. In the 4 x 100 metre freestyle relay, he holds a silver medal at the 2017 World Championships.
Tatiane Mayumi Sakemi is a Brazilian swimmer of Japanese ancestry, who specialized in breaststroke events. She is a member of the swimming team for Esporte Clube Pinheiros in São Paulo.
Daiene Marçal Dias is a Brazilian competitive swimmer.
Etiene Pires de Medeiros is a Brazilian competitive swimmer who participates in backstroke and freestyle events. Widely regarded as the best Brazilian woman swimmer of all time, Medeiros was the first Brazilian to win an individual gold medal in a World Championship and Pan American Games, and the first to be a world record-holder in the modern era
Riley Janes is a Canadian former competition swimmer who specialized in freestyle and backstroke events. He is a single-time Olympian (2004), and is part of the bronze-medal Canadian medley relay team at the 2002 Commonwealth Games in Manchester, England.
Nicolas Fink is an American five-time world champion in breaststroke events. He is a world record holder in the short course 4×100 meter medley relay and 4×50 meter mixed medley relay. He is the Americas record holder in the short course 50 meter breaststroke, 100 meter breaststroke, and 200 meter breaststroke as well as the American record holder in the long course 50 meter breaststroke. In the 50 meter breaststroke, he won the World Short Course titles in 2021 and 2022 and World Long Course title in 2022. In the 100 meter breaststroke, he is the 2022 World Short Course gold medalist. In the 200 meter breaststroke, he is the 2021 World Short Course gold medalist.
Matheus Paulo de Santana is a Brazilian swimmer. He will represent DC Trident at the International Swimming League during the 2020 season.
Jesse Aungles is an Australian Paralympic swimmer. He represented Australia at the 2016 Summer Paralympics and the 2020 Summer Paralympics
Kylie Jacqueline Masse is a Canadian competitive swimmer. She is a four-time Olympic medallist, having tied for the bronze medal at the 2016 Summer Olympics in the 100 m backstroke and then won silver medals at the 2020 Summer Olympics in both the 100 m and 200 m backstroke and a bronze medal in the 4x100 m medley. Masse is a two-time world champion in the 100 m backstroke, breaking the eight year old world record in the process, which she held until July 2018. While winning her title in Budapest at the 2017 World Aquatics Championships she became the first Canadian woman to become a world champion in a swimming event. She subsequently became the first Canadian woman to defend her world title at the 2019 World Aquatics Championships. She is currently the captain for the Toronto Titans of the International Swimming League.
Corey Charles Garth Main is a New Zealand swimmer who qualified to compete at the 2016 Summer Olympics to be held in Rio de Janeiro, Brazil, in the men's 100 metre backstroke.
Blake John Pieroni is a three-time Olympic gold medalist in swimming. He is a two time Olympian and gold medalist in the 4×100-meter freestyle relay at both the 2016 Summer Olympics and the 2020 Summer Olympics. On the relay in 2016, he swam in the prelims of the race, on the 2020 Olympics 4×100-meter freestyle relay he swam in both the prelims and the final. He also won a gold medal in the 4x100-meter medley relay at the 2020 Olympic Games, swimming the freestyle leg of the relay in the prelims.
Hannah Margaret McNair "Maggie" Mac Neil is a Canadian competitive swimmer. A 100 metre butterfly event specialist, she is the 2020 Olympic champion, 2019 World (LC) champion, two-time World (SC) champion, 2022 Commonwealth champion, and 2023 Pan American champion. She holds the current Americas record (55.59s), the short course world record, the Commonwealth record, and Pan American record in the event.
Giles Smith is an American competitive swimmer who specializes in the butterfly and freestyle events. He currently represents the DC Trident which is part of the International Swimming League.
Tom Williams 
Claude Lamy 
Hilton Woods 
Gustavo Borges 
José Meolans 
Marcos Hernández 
George Bovell 
Lamar Taylor 
Ricardo Vargas 
Alfonso Mestre 
Esteban Enderica 
