Heat 6
vendredi 21 mai 2021, 08h17 GMT – 08h17 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Adam Peaty | Great Britain | 26.34″ |
| 2 | Kirill Prigoda | Russia | + 0.59″ |
| 3 | James Wilby | Great Britain | + 1.17″ |
| 4 | Danil Semyaninov | Russia | + 1.24″ |
| 5 | Ross Murdoch | Great Britain | + 1.39″ |
| 6 |  Théo Bussière | France | + 1.61″ |
| 7 | Valentin Bayer | Austria | + 1.68″ |
| 8 | Aleksandr Zhigalov | Russia | + 1.82″ |
| 9 | Martin Allikvee | Estonia | + 2.11″ |