Heat 1
samedi 5 août 2017, 11h45 GMT – 11h45 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Fred Kerley | United States | 44.92″ |
| 2 |  Lalonde Gordon | Trinidad & Tobago | + 0.1″ |
| 3 |  Kevin Borlée | Belgium | + 0.17″ |
| 4 |  Pavel Maslak | Czech Republic | + 0.18″ |
| 5 | Matthew Hudson-Smith | Great Britain | + 0.39″ |
| 6 |  Lucas Carvalho | Brazil | + 0.94″ |
| 7 | Lucas Búa | Spain | + 1.08″ |
| 8 | Collins Omae Gichana | Kenya | + 1.18″ |
| 9 | Bachir Mahamat | Chad | + 2.58″ |