Brazilian swimmer Cesar Cielo set the 100-metre freestyle world record of 46.91 seconds in 2009.
Notes on verification
Confirmed by multiple independent high-quality sources including sports journalism outlets (CNN, ESPN, SwimSwam) and reference databases (Olympedia, Olympics.com), with consistent details on name, time, event, and date.
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)
- https://www.cnn.com/2022/08/14/sport/david-popovici-100m-freestyle-record-swimming-spt-intl/index.html (cnn.com)
- https://www.espn.com/olympics/swimming/story/_/id/34394687/romanian-swimmer-david-popovici-17-breaks-world-record-100-freestyle (espn.com)
- http://english.cctv.com/20091220/101965.shtml (english.cctv.com)