Leisel Marie Jones, OAM is an Australian former competition swimmer and Olympic gold medallist. A participant in the 2000 Summer Olympics – at just 15 years old – and 2004 Summer Olympics, she was part of gold-medal-winning Australian team in the women's 4×100-metre medley relay at the Athens Games in 2004 and a gold medallist for 100-metre breaststroke in the 2008 Summer Olympics in Beijing.
Yuliya Andreyevna Yefimova is a Russian competitive swimmer. She is the Russian record holder in the 200 metre individual medley, 50 metre breaststroke, 100 metre breaststroke, and 200 metre breaststroke. After making her Olympic debut in 2008, she went on to win the bronze medal in the 200 metre breaststroke in 2012, and silver medals in the 100 metre and 200 metre breaststroke in 2016. She is a six-time World Champion, winning the 50 metre breaststroke in 2009 and 2013, the 100 metre breaststroke in 2015, and the 200 metre breaststroke in 2013, 2017, and 2019. In 2019, she became the first woman to win the 200 metre breaststroke at a FINA World Aquatics Championships three times. She is a former world record holder in the long course 50 metre breaststroke. She has won 109 medals, including 48 gold medals, at Swimming World Cups.
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.
Rhiannon Leier is a Canadian former competition swimmer who specialized in breaststroke events. She is a multiple-time Canadian record holder, a two-time finalist at the FINA World Championships, and a six-time NCAA All-American honoree. She also won a bronze medal, as a member of the Canadian swimming team, in the women's 4x100-metre medley relay at the 2002 Pan Pacific Swimming Championships in Yokohama, Japan, clocking at 4:05.59. Leier is also the granddaughter of former baseball player, track athlete, and ice hockey player Edward Leier, who played two seasons with the Chicago Blackhawks in the National Hockey League.
Jaclyn Pangilinan is a Filipino-American former swimmer, who specialized in breaststroke events. She is a two-time Filipino record holder, a four-time Ivy League champion in the 100 and 200 m breaststroke, and a multiple-time medalist at the Southeast Asian Games. Born to a Filipino father, and an American mother, Pangilinan holds a dual citizenship to compete collegiately and internationally in swimming.
Diána Reményi is a Hungarian former swimmer, who specialized in breaststroke and individual medley events. She is a two-time junior European champion, and a finalist at the European Short Course Swimming Championships. She is also a member of Budapesti Spartacus SC, and is coached and trained by György Turi.
Imaday Núñez González is a Cuban former swimmer, who specialized in breaststroke events. She won a total of three medals in the breaststroke and medley relay at the 1998 Central American and Caribbean Games in Maracaibo, Venezuela.
Annabelle Jane Carey was a New Zealand swimmer, who specialized in breaststroke events. As of 2006, she currently holds a New Zealand record of 1:09.26 in the 100 m breaststroke from the World Championship Trials in Auckland. In the same year she helped out the New Zealand team to pull off a fourth-place effort in the medley relay at the Commonwealth Games in Melbourne, Australia, with a record-breaking time of 4:06.30.
Ben-Rachmiel Labowitch is a New Zealand former swimmer, who specialized in breaststroke events. Since his mother is a New Zealand citizen, Labowitch claims a dual citizenship which allowed him to try out and make the New Zealand Olympic team. Labowitch is also a former member of North Shore Swim Club under his coach Thomas Ensorg, and a graduate of Drury University in Springfield, Missouri, where he played for the Drury Panthers.
Arsenio Alexander López Rosario, also known as Alex Lopez, is a Puerto Rican former swimmer and three-time Olympian who specialized in breaststroke and individual medley events.
Yevgeny Petrashov is a Kyrgyzstani former swimmer, who specialized in breaststroke events. He is a three-time Olympian, and a former Kyrgyzstan record holder in both 100 and 200 m breaststroke.
Seraina Prünte is a Swiss former swimmer, who specialized in freestyle events. She currently holds a Swiss record in the 100 m freestyle (56.06) from the German Olympic Trials in Berlin (2008). A single-time Olympian (2004), Prunte played for the Nikar Swimming Club in Heidelberg, before she trained under head coach Dirk Reinecke as part of the Swiss national team.
Nicole Zahnd is a retired Swiss swimmer, who specialized in sprint freestyle events. She was born in Bern. She is a two-time Olympian, and a top 8 finalist in the 200 m freestyle at the 2001 European Short Course Swimming Championships in Antwerp, Belgium. Zahnd played for two swimming clubs in Geneva, before she trained under head coach Dirk Reinecke as part of the Swiss national team. Zahnd is also the wife of former medley swimmer and two-time Olympian Yves Platel.
Carla Stampfli is a Swiss former swimmer, who specialized in butterfly events and later became a professional triathlete. She is a single-time Olympian (2004), a 27-time Swiss swimming champion, and a short-course national record holder in the 100 m butterfly (2007).
Switzerland 
