Dorothy Elizabeth Harrison (born 16 March 1950) is an English former competitive swimmer who represented Great Britain in the Olympic Games and European championships.
 She won a bronze medal in the 200-metre breaststroke at the 1970 European Aquatics Championships.
 She competed in five breaststroke and medley relay events at the 1968 and 1972 Summer Olympics; her best achievements were sixth place in the 4×100-metre medley relay in 1968 and eighth place in the 100-metre breaststroke in 1972.
 In the medley relay she competed with Margaret Auton, Wendy Burrell and Alexandra Jackson.
Susannah Claire "Suki" Brownsdon (born 16 October 1965) is an English former competitive swimmer who won a silver medal in the women's 100-metre breaststroke at the 1981 European Championships, and represented Great Britain at four consecutive Olympic Games, with her best results being sixth place in the 100-metre breaststroke final in 1980 and seventh place in the 200-metre breaststroke final in 1984.
 She also represented England at three Commonwealth Games, winning a total of five medals.
Adam Peaty, MBE (born 28 December 1994) is a British competitive swimmer who specializes in the breaststroke.
 He has represented Great Britain at the Olympic Games, FINA World Championships, and European Championships, and England in the Commonwealth Games.
 He won the gold medal in the 100m breaststroke at the 2016 Olympics, the first by a male British Swimmer in 24 years.
 He is the current holder of the world record in 50 and 100m breaststroke.
Bernard Desmarais (born 17 June 1971) is a Mauritian swimmer.
 He represented his country at the 1992 and 1996 Olympics.
 In 1992, he competed in the 100 metre and 200 metre breaststroke competitions, but finished 45th in each event with times of 1:07.75 and 2:31.52 respectively.
 In 1996, he competed only in the 100 metre breaststroke event and finished 43rd out of 45 competitors with a time of 1:09.05.
Ross Murdoch (born 14 January 1994) is a Scottish competitive swimmer who has represented Great Britain in the Summer Olympics, the FINA world championships and the LEN European championships, and Scotland in the Commonwealth Games.
 Murdoch won the gold medal in the 200 metre breaststroke at the 2014 Commonwealth Games in Glasgow, beating favourite, Olympic silver medalist and fellow Scot Michael Jamieson.
 In 2015, he formed part of the Great Britain squad that won gold in the mixed 4 x 100 metre medley relay at the 2015 World Aquatics Championships, swimming in the qualifying heats, and adding a relay world title to the individual bronze won days earlier in the men's 100 metre breaststroke behind teammate Adam Peaty.
 In 2016, he qualified for the 100m breaststroke for the Great Britain team in the 2016 Summer Olympics in Rio de Janeiro.
 He later won his first European title with a gold medal in the 200 metre breaststroke, also picking up a silver medal in the 100 metre breaststroke silver medal behind teammate Adam Peaty and a bronze medal in the 50 metre breaststroke.
Antani Ivanov (Bulgarian: Антъни Иванов , born 17 July 1999) is a Bulgarian swimmer.
 He competed in the men's 50 metre butterfly, men's 100 metre butterfly and men's 200 metre butterfly events at the 2017 World Aquatics Championships.
 He finished 38th in the 50 metre butterfly, 41st in the 100 metre butterfly and 8th in the 200 metre butterfly, setting a national record of 1:55.55 in the heats.
 His final in the 200 metre was the first for a bulgarian swimmer since Mihail Alexandrov's 6th place at the 2007 World Aquatics Championships men's 100 metre breaststroke.
Cody Miller (born January 9, 1992) is an American competitive swimmer who specializes in the breaststroke.
 At the 2016 Summer Olympics, Miller won a bronze medal in the men's 100 metre breaststroke and a gold medal in the men's 4 × 100 metre medley relay, in which he performed the breaststroke leg of the final.
Andrew Willis (born 3 December 1990) is an English competitive swimmer who has represented Great Britain in the Olympics and FINA world championships, and England in the Commonwealth Games.
 At the 2012 Summer Olympics in London, he competed in the men's 200-metre breaststroke, finishing in 3rd place overall in the heats and qualifying for the final where he finished in 8th place.
 He was one of the very few British swimmers to achieve a personal best at the 2012 Olympics.
 He also finished 4th in the 2013 World Championships in the 200-metre breaststroke.
 He went on to win a bronze medal at the 2014 Commonwealth Games in the 200-metre breaststroke final in Glasgow.
Petra Hillenius (born 7 February 1968 in Woerden) is a Dutch former breaststroke swimmer, who competed at the 1984 Olympics in Los Angeles.
 She finished 19th in the 100 metre breaststroke and 18th in the 200 metre breaststroke.
 In 2014, she became a board member of the Royal Dutch Swimming Federation.
Huang Wenpan is a Chinese swimmer.
 He won four gold medals at the 2016 Summer Paralympics: at the Men's 50 metre freestyle S3 event with a world record and paralympic record of 39.24, at the Men's 200 metre freestyle S3 event with a world record and paralympic record of 3:09.04, at the Men's 50 metre breaststroke SB2 event with a world record and paralympic record of 50.65 and at the Men's 150 metre individual medley SM3 event with a world record and paralympic record of 2:40.19.
 He also won a silver medal at the Men's 50 metre backstroke S3 event with 46.11.

Question: Which world record are held by the swimmer who beat Ross Murdoch in the European 100 metre breaststroke?
Answer: 50 and 100m breaststroke