The U.S. Open Swimming Championships, or U.S. Open, is a championship meet organized by USA Swimming which is open to international teams/swimmers. It was first held in 1985, and was held annually in December through 2006. Beginning in 2007, the meet's first-weekend-of-December timing was given over to the resurrected USA Short Course Nationals, and the U.S. Open moved to being held on an as-needed basis. Since 2007, the meet has been held in early August, in years where the U.S. Nationals are not held in August.
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 is a history of the progression of the World Record for the Swimming event: the 50 butterfly. It is a listing of the fastest-time-ever in the event, in both long course (50m) and short course (25m) swimming pool. These records are maintained/recognized by FINA, which oversees international competitive swimming and Aquatics.
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.
Matija "Matt" Jaukovic is an Australian and former Montenegrin competitive swimmer. He is a former world record-holder in the short course 50 metre butterfly. Over the course of his career he has also held Commonwealth, Oceanian, Australian national, and Australian All Comers records in the short course 50 metre butterfly as well as an Australian All Comers record in the 100 metre butterfly. He won a total of 10 medals in international competitions, all at the FINA Swimming World Cup, seven of which were gold medals and three of which were silver medals. Before competing representing Australia, he set a Montenegrin national record in the 100 metre backstroke.
The 2009 FINA Swimming World Cup was a series of five short course (25 m) swimming meets, held in October and November 2009.
The 2010 FINA Swimming World Cup was a series of seven short-course meters (25m) meets, held from September-early November 2010. The 2010 series was again titled sponsored by Arena.
Thomas Allen Shields is an American competitive swimmer. He is a two-time Olympian and the current American record-holder in the short course 50-meter butterfly and 200-meter butterfly. At the 2016 Summer Olympics, he won a gold medal in the 4×100-meter medley relay, swimming the butterfly leg of the relay in the prelims. Later the same year, he became the first American to swim faster than 44 seconds in the 100-yard butterfly, setting a new American record of 43.84 seconds.
The 2011 FINA Swimming World Cup was a series of seven, two-day, short course meets in seven different cities in October and November 2011. Arena was again the title sponsor for the series, with Omega serving as official timer.
The 2012 FINA Swimming World Cup was a series of eight, two-day, short course meets in eight different cities in October and November 2012. Arena was again the title sponsor for the series, with Omega serving as official timer.
The 2013 FINA Swimming World Cup was a series of eight, two-day, short course meets in eight different cities between August and November 2013. Arena was again the title sponsor for the series, with Omega serving as official timer.
The 2014 FINA Swimming World Cup was a series of seven, two-day, short course meets in seven different cities between August and November 2014. Mastbank was again the title sponsor for the series, with Omega serving as official timer.
Amanda Lim is a Singaporean freestyle swimmer.
The 2015 FINA Swimming World Cup was a series of eight, two-day, long course swimming meets in eight different cities between August and November 2015. Airweave was the title sponsor for the series, with Omega serving as official timer. This was the first World Cup edition held in a long-course pool, allowing swimmers to prepare for next year's Olympics, which are also held in long course.
The 2016 FINA Swimming World Cup was a series of nine two-day meets in nine different cities between August and October 2016. After switching to long-course pools in the previous year's pre-Olympic season, this edition returned to the usual short-course format. Like the previous short course World Cup in 2014, 36 events were scheduled. The total amount of prize money was US$ 2,178,000. The first meet started 13 days after the final day of the Olympic pool swimming program.
The 2017 FINA Swimming World Cup was a series of eight two-day meets in eight different cities between August and November 2017. This edition was held in the usual short-course format. Like the previous short course World Cup in 2016, 36 events were scheduled.
The 2019 FINA Swimming World Cup was a series of seven three-day meets in seven different cities between August and November 2019. This edition was held in the long course format.
Belo Horizonte, Brazil 
Durban, South Africa 
Sydney, Australia 
Singapore 
Moscow, Russia 
Stockholm, Sweden 
Berlin, Germany 
