Final | | points | gap | pts | L | 1. Cameron McEvoy | Australia | 21.25s | | 952 | 5 | 2. Benjamin Proud | Great Britain | 21.30s | +0.05s | 946 | 4 | 3. Florent Manaudou | France | 21.56s | +0.31s | 912 | 1 | 4. Josh Liendo | Canada | 21.58s | +0.33s | 909 | 8 | 5. Kristian Gkolomeev | Greece | 21.59s | +0.34s | 908 | 7 | 6. Caeleb Dressel | United States | 21.61s | +0.36s | 905 | 2 | 7. Leonardo Deplano | Italy | 21.62s | +0.37s | 904 | 3 | 8. Jordan Crooks | Cayman Islands | 21.64s | +0.39s | 902 | 6 |
Venue: Paris La Defense Arena. | World Record: Cesar Cielo, Brazil 20.91s Sao Paulo Brazil 18th December 2009 | Olympic Record: Caeleb Dressel, United States 21.07s Tokyo, Japan, 1st August 2021 | Olympic Qualification Time: 21.96s (Rio 2016). Olympic Consideration Time: 22.07s. |
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| Best 8 times advanced to Final. Maxime Grousset, France withdrew and was replaced by Josh Liendo, Canada. |
Semi 1 | | points | gap | pts | L | 4. Jordan Crooks | Cayman Islands | 21.54s | +0.16s | 914 | 4 | 5. Caeleb Dressel | United States | 21.58s | +0.20s | 909 | 1 | 6. Maxime Grousset | France | 21.60s | +0.22s | 907 | 8 | 10.Thomas Fannon | Ireland | 21.74s | +0.36s | 889 | 3 | 12.Lorenzo Zazzeri | Italy | 21.83s | +0.45s | 878 | 5 | 13.Meiron Amir Cheruti | Israel | 21.91s | +0.53s | 869 | 2 | 14.Ben Armbruster | Australia | 21.94s | +0.56s | 865 | 6 | 15.Gabriel Castano Garcia | Mexico | 21.99s | +0.61s | 859 | 7 |
Semi 2 | | points | gap | pts | L | 1. Cameron McEvoy | Australia | 21.38s | | 935 | 4 | 1. Benjamin Proud | Great Britain | 21.38s | | 935 | 3 | 3. Leonardo Deplano | Italy | 21.50s | +0.12s | 919 | 6 | 7. Kristian Gkolomeev | Greece | 21.62s | +0.24s | 904 | 2 | 8. Florent Manaudou | France | 21.64s | +0.26s | 902 | 5 | 9. Josh Liendo | Canada | 21.69s | +0.31s | 895 | 8 | 11.Vladyslav Bukhov | Ukraine | 21.76s | +0.38s | 887 | 7 | 16.Diogo Matos Ribeiro | Portugal | 22.01s | +0.63s | 857 | 1 |
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