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.
Ariana Kukors is an American former competition swimmer and former world record holder in the 200-meter individual medley. Ariana now works in private coaching related to athletic performance. Kukors has won a total of seven medals in major international competition, two golds, three silvers, and two bronze spanning the World and the Pan Pacific Championships. She placed fifth in the 200-meter individual medley event at the 2012 Summer Olympics.
The Women's 400 Individual Medley at the 10th FINA World Swimming Championships (25m) was swum on 15 December 2010 in Dubai, United Arab Emirates. 28 swimmers swam in the morning preliminary heats, from which the top-8 advanced to the final that evening.
The Men's 400 Individual Medley at the 10th FINA World Swimming Championships (25m) was swum on 16 December 2010 in Dubai, United Arab Emirates. 35 individuals swam in the Preliminary heats of the event in the morning, with the top-8 finishers advancing on the Final that evening.
The Women's 4×100 Medley Relay at the 10th FINA World Swimming Championships (25m) was swum on 17 December 2010 in Dubai, United Arab Emirates. 21 nations swam in the preliminary heats, with the top-8 advancing to swim again in the final.
The Men's 200 Breaststroke at the 10th FINA World Swimming Championships (25m) was swum 17 December. 57 individuals swam in the Preliminary heats in the morning, with the top-8 finishers advancing to the Final in the evening.
The Women's 100 Individual Medley at the 10th FINA World Swimming Championships (25m) took place 16–17 December 2010 in Dubai, United Arab Emirates. The preliminary heats and semifinals were swum on 16 December; the final on 17 December.
The Women's 200 Individual Medley at the 10th FINA World Swimming Championships (25m) was swum on 18 December 2010 in Dubai, United Arab Emirates. 38 swimmers swam in the preliminary heats, with the top-8 finishers advancing to the final that evening.
The Men's 50 Butterfly at the 10th FINA World Swimming Championships (25m) was swum 17–18 December 2010 in Dubai, United Arab Emirates. On 17 December 119 individuals swam in the Preliminary heats in the morning, with the top-16 finishers advancing to swim again in the Semifinals that evening. The top-8 from the Semifinals then advanced to swim the Final the next evening.
The Men's 100 Individual Medley at the 10th FINA World Swimming Championships (25m) was swum 18–19 December 2010 in Dubai, United Arab Emirates. On 18 December, 83 individuals swam in the Preliminary heats in the morning, with the top-16 finishers advancing to the Semifinals that evening. The top-8 finishers from Semifinals then advanced to the Final the next evening.
The Men's 200 Butterfly at the 10th FINA World Swimming Championships was swum on 19 December 2010 in Dubai, United Arab Emirates. 44 individuals swam in the preliminary heats in the morning, with the top-8 finishers advancing to the final that evening.
The men's 200 metre individual medley event at the 11th FINA World Swimming Championships (25m) took place 14 December 2012 at the Sinan Erdem Dome. The event was won by American Ryan Lochte. In the final, Lochte broke his own world record of 1:50.08 set in 2010 with a time of 1:49.63, thus becoming the first individual under 1:50 in the event.
Daiya Seto is a Japanese professional swimmer who specializes in individual medley, butterfly, breaststroke, and freestyle events. He holds the world record in the short course 400-metre individual medley and formerly held the world record in the short course 200-metre butterfly. He won the gold medal in the 400-metre individual medley at the 2012, 2014, 2016, 2018, 2021, and 2022 world short course championships, as well as at the 2013, 2015, and 2019 world long course championships.
Colin Samuel Bensadon is a Gibraltarian swimmer.
Kaylee Rochelle McKeown is an Australian swimmer and triple Olympic gold medalist. She is the world record holder in the long course 50 metre backstroke, 100 metre backstroke and both the long course and short course 200 metre backstroke. She won gold in both the 100 metre and 200 metre backstroke, as well as the 4×100 metre medley relay at the 2020 Summer Olympics staged in Tokyo in 2021. In 2023, she was named as the "Best Female Swimmer of the Year" by World Aquatics, after sweeping gold in all three events of backstroke at all three World Cup legs, held in Berlin, Athens and Budapest in October, 2023.
Leonardo Coelho Santos is a Brazilian swimmer.
Thomas Ceccon is an Italian swimmer. He is a world record holder in the long course 100 metre backstroke and the short course 4×100 metre freestyle relay. He is also the Italian record holder in the long course 50 metre backstroke and 50 metre butterfly. He is the 2022 World champion in the 100 metre backstroke and 2022 European champion in the 100 metre backstroke and 50 metre butterfly. In the 100 metre individual medley, he won the gold medal at the 2022 World Short Course Championships and the bronze medal at the 2021 World Short Course Championships. At the 2020 Summer Olympics, he won a silver medal in 4×100 metre freestyle relay, a bronze medal in the 4×100 metre medley relay, placed fourth in the 100 metre bacsktroke, and placed twelfth in the 100 metre freestyle.
Kieran Smith is an American swimmer specializing in freestyle and individual medley events. He currently co-holds short course world records in the 4×200 meter freestyle relay and the 4×100 meter medley relay. He is the Americas record holder in the long course 400 meter freestyle and the American record holder in the 500 yard freestyle. In the 400 meter freestyle, he won the bronze medal at the 2020 Summer Olympics and the gold medal at the 2022 World Short Course Championships. Following a fourth-place finish in the 4×200 meter freestyle relay at the 2020 Summer Olympics, he won gold medals in the event at the 2021 World Short Course Championships, 2022 World Aquatics Championships, and the 2022 World Short Course Championships.
Sergey Geybel is a competitive Russian swimmer specializing in breaststroke events. He is a former world record holder in the 4×100-metre medley relay and the 4×50-metre medley relay. He won a gold medal at the 2008 World Short Course Championships as part of the world-record-setting finals relay team in the 4×100-metre medley relay. He also won two silver medals and one bronze medal over the course of his career in the 4×50-metre medley relay at the European Short Course Championships.
Trenton Jeffrey Julian is an American competitive swimmer. He is a world record holder in the short course 4×200 meter freestyle relay and 4×100 meter medley relay. He won a gold medal in the 4×200 meter freestyle relay at the 2019 World University Games. He followed up with gold medals in the 4×200 meter freestyle relay at the 2021 World Short Course Championships, 2022 World Aquatic Championships, and 2022 World Short Course Championships. In the 4×100 meter medley relay, he won a world title and gold medal at the 2022 World Short Course Championships, swimming butterfly on each the prelims and finals relay.
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