The men's 50 metre butterfly at the 2007 World Aquatics Championships took place on 25 March and on the evening of 26 March (final) at Rod Laver Arena in Melbourne, Australia. 160 swimmers were entered in the event, of which 152 swam.
The Women's 200m Butterfly at the 2007 World Aquatics Championships took place on 28 March and the evening of 29 March (finals) at the Rod Laver Arena in Melbourne, Australia. 57 swimmers were entered in the event, of which 54 swam.
This article includes the world record progression for the 4×200 metres freestyle relay, and it shows the chronological history of world record times in that competitive swimming event. The 4×200 metres freestyle relay is a relay event in which each of four swimmers on a team swims a 200-metre freestyle leg in sequence. The world records are recognized by and maintained by FINA, the international competitive swimming and aquatics federation that oversees the sport in international competition.
The men's 200 metre butterfly at the 2007 World Aquatics Championships took place on 27 March and on the evening of 28 March (final) at Rod Laver Arena in Melbourne, Australia. 64 swimmers were entered in the event, of which 62 swam.
The Women's 200m Breaststroke at the 2007 World Aquatics Championships took place on 29 March and the evening of 30 March (finals) at the Rod Laver Arena in Melbourne, Australia. 55 swimmers were entered in the event, of which 54 swam.
The men's 200 metre individual medley (IM) at the 2007 World Aquatics Championships took place on 28 March and on the evening of 29 March (final) at Rod Laver Arena in Melbourne, Australia. 79 swimmers were entered in the event, of which 74 swam.
The men's 100 metre butterfly at the 2007 World Aquatics Championships took place on 30 March and on the evening of 31 March (final) at Rod Laver Arena in Melbourne, Australia. 123 swimmers were entered in the event, of which 118 swam.
The men's 200 metre breaststroke at the 2007 World Aquatics Championships took place on 29 March and on the evening of 30 March (final) at Rod Laver Arena in Melbourne, Australia. 85 swimmers were entered in the event, of which 79 swam.
The heats for the women's 200 m freestyle race at the 2009 World Championships took place in the morning and evening of 28 July and the final took place in the evening session of 29 July at the Foro Italico in Rome, Italy.
The women's 200 m butterfly at the 2009 World Championships took place on 29 July and on the evening of 30 July (finals) at the Foro Italico in Rome, Italy.
The heats for the Men's 200 metre Individual Medley race at the 2009 World Championships took place in the morning and evening of 29 July and the final took place in the evening session of 30 July at the Foro Italico in Rome, Italy. The order of swimming in the medley was butterfly, backstroke, breaststroke, freestyle.
The men's 200 metre backstroke at the 2007 World Aquatics Championships took place on 29 March and 30 March (final) at Rod Laver Arena in Melbourne, Australia. 57 swimmers were entered in the event, of which 55 swam.
Chad Guy Bertrand le Clos, OIS is a South African competitive swimmer who is an Olympic, World and Commonwealth Games champion. He is the African record, Commonwealth record, and South African record holder in the short course and long course 200-metre butterfly and the short course 100-metre butterfly. He also holds the African records and South African records in the long course 200-metre freestyle and 100-metre butterfly, and the short course 100-metre freestyle. Formerly, he was a world record holder in the short course 100-metre butterfly and 200-metre butterfly.
Kristóf Milák is a Hungarian swimmer. He is the current holder of the world record in the long course 200 metre butterfly and the European record in the long course 100 metre butterfly. He also currently holds the Hungarian record in the short course 50 metre backstroke. At his first Olympic Games, the 2020 Summer Olympics, he won a gold medal in the 200 metre butterfly and a silver medal in the 100 metre butterfly. He has also won three gold medals and one silver at the World Aquatic Championships, as well as three gold medals at the European Aquatics Championships. He was the gold medalist in the 400 metre freestyle, 200 metre freestyle, and 200 metre butterfly events at the 2018 Summer Youth Olympics.
