It depends on the swim stroke.
For Freestyle, the fastest 50m world record is held by a US swimmer named Steve Crocker. The time is: 21.64.
For Butterfly, the fastest 50m world record is held by UK swimmer Mark Foster, at 23.55.
For Breaststroke, the 50m world record is held by Mark Warnecke of Germany, with a time of 27.00.
And for Backstroke, the 50m world record is claimed by another US swimmer, Jeff Rouse, who swam it in just 24.37.
Austin Crawford (Dallas, Texas) 50 meter dash world record: 4.98 second
Michael Phelps has never swum competitively in the 50 m distance. All of his gold medals were 100 m, 200 m, or 400 m. He holds the world record in the 100 m butterfly at 49.82 seconds, and swam an unofficial record 49.72 second butterfly relay leg in 2009.
Florence Joyner
kenenisa Bekele
9.58 seconds for 100 m 19.19 seconds for 200 m
11.2
21.34s by Florence Griffith-Joyner
Deb Robinson
Barbara Blackburn who can maintain 150 w/m for up to 50 minutes. She also has been clocked at 212 w/m.
That is Olimpiada Ivanova of Russia who set the world record in the 20 km walk at 1:24:50 in 2001.
The current world record for the men's 50 meters dash is 5.56 seconds, set by Christian Coleman in 2018. For women, the world record is 5.96 seconds, set by Irina Privalova in 1995.
The current world record for the women's hammer was set by Tatyana Lysenko who threw 77.80 m in Tallinn, Estonia on 15 August 2006.