The World Aquatics Junior Swimming Championships is an international swimming championship event organized biennially by World Aquatics for swimmers aged 14–18 years as of the 31st December of the year of the competition. It is usually held on odd years. Prior to 2023, the event was known as the FINA World Junior Swimming Championships and was open to female swimmers aged 14–17 and male swimmers aged 15–18 as of the 31st of December of the year of the competition.
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 freestyle relay, and it shows the chronological history of world record times in that competitive swimming event. The 4×100 metres freestyle relay is a relay event in which each of four swimmers on a team swims a 100-metre freestyle leg in sequence. The world records are recognized by and maintained by FINA, the international competitive swimming and aquatics federation that overseas the sport in international competition.
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.
The men's 200-metre butterfly event at the 2001 World Aquatics Championships took place between 23 July – 24 July. Both the heats and semifinals were held on 23 July with the heats being held in the morning session and the semifinals being held in the evening session. The final was held on 24 July.
The men's 50 metre freestyle event at the 2001 World Aquatics Championships was held on 22 and 23 July 2001 (final) at the Fukuoka, Japan.
The men's 100 metre freestyle event at the 2001 World Aquatics Championships took place 27 July. The heats and semifinals were held on 26 July.
The men's 800 metre freestyle event at the 2001 World Aquatics Championships took place 24 July. The heats took place 23 July, and the final was held on 24 July.
The men's 1500 metre freestyle event at the 2001 World Aquatics Championships took place 29 July. The heats took place 28 July, while the final was held on 29 July.
The men's 50 metre backstroke event at the 2001 World Aquatics Championships took place 25 July. The heats and semifinals took place 24 July, with the final being held on 25 July.
Emma Jennifer McKeon, is an Australian competitive swimmer. She is a seven-time world record holder, three current and four former, in relays. Her total career haul of 11 Olympic medals following the 2020 Olympic Games made her Australia's most decorated Olympian and included one gold medal from the 2016 Summer Olympics in Rio de Janeiro and four gold medals from the 2020 Summer Olympics in Tokyo. With four gold and three bronze medals she was the most decorated athlete across all sports at the 2020 Summer Olympics, and tied for the most medals won by a woman in a single Olympic Games. She has also won 20 medals, including five gold medals, at the World Aquatics Championships; and a record 20 medals, including 14 gold, at the Commonwealth Games.
Evgeny Mikhailovich Rylov is a Russian competitive swimmer and Olympic champion specializing in backstroke events. He won three gold medals at the 2014 Summer Youth Olympics in Nanjing, and a bronze medal at his senior international debut at the 2015 World Championships in Kazan. He also won a bronze medal at the 2016 Summer Olympics in Rio de Janeiro and a gold medal at the 2017 World Championships in Budapest, both were in the 200 metre backstroke event. In 2018, at the 2018 World Short Course Championships, he won gold medals in the 200 metre backstroke and 50 metre backstroke. At the 2019 World Championships, he won a gold medal in the 200 metre backstroke, silver medal in the 100 metre backstroke, and silver medal in the 50 metre backstroke. He won the gold medal in the 100 metre backstroke and 200 metre backstroke at the 2020 Summer Olympics in Tokyo.
The men's 100 meter backstroke event at the 2001 World Aquatics Championships took place 23 July. The heats and semifinals took place 22 July, with the final being held on 23 July.
The women's 100 metre breaststroke event at the 2001 World Aquatics Championships took place 23 July. The heats and semifinals took place 22 July, with the final being held on 23 July.
The women's 200 metre butterfly event at the 2001 World Aquatics Championships took place 23 July. The heats and semifinals took place 22 July, with the final being held on 23 July.
