Heat 7
vendredi 28 juillet 2017, 10h09 GMT – 10h09 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  James Guy | Great Britain | 51.16″ |
| 2 |  Mehdy Metella | France | + 0.3″ |
| 3 |  Konrad Czerniak | Poland | + 0.34″ |
| 4 |  László Cseh | Hungary | + 0.39″ |
| 5 | Grant Irvine | Australia | + 0.51″ |
| 6 | Mathys Goosen | Netherlands | + 0.96″ |
| 7 | Yuki Kobori | Japan | + 1.01″ |
| 8 | Luis Carlos Martinez | Guatemala | + 1.02″ |
| 9 | Daniil Pakhomov | Russia | + 1.31″ |
| 10 | Dylan Carter | Trinidad & Tobago | + 1.59″ |