Brazilian swimmer Cesar Cielo set the 100-metre freestyle world record of 46.91 seconds in 2009.
Notes on verification
Multiple independent authoritative sources (Olympedia, Wikipedia, Olympics.com, SwimSwam) confirm the exact time, date, and location of the record.
Sources
- The science games — ABC Science Archive (abc.net.au)
- https://www.olympedia.org/athletes/115648 (olympedia.org)
- https://www.olympics.com/en/athletes/cesar-cielo-filho (olympics.com)
- https://swimswam.com/david-popovici-goes-46-86-breaks-cielos-13-year-old-100-free-world-record/ (swimswam.com)