Semifinal
mercredi 8 août 2018, 19h35 GMT – 19h44 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Matthew Hudson-Smith | Great Britain | 44.76″ |
| 2 |  Jonathan Borlee | Belgium | + 0.11″ |
| 3 | Karsten Warholm | Norway | + 0.15″ |
| 4 | Luka Janezic | Slovenia | + 0.17″ |
| 5 | Kevin Borlée | Belgium | + 0.31″ |
| 6 |  Karol Zalewski | Poland | + 0.35″ |
| 7 | Ricardo Dos Santos | Portugal | + 0.38″ |
| 8 |  Matteo Galvan | Italy | + 0.41″ |
| 9 |  Oscar Husillos | Spain | + 0.41″ |
| 10 | Rabah Yousif | Great Britain | + 0.54″ |
| 11 |  Liemarvin Bonevacia | Netherlands | + 0.63″ |
| 12 | Dwayne Cowan | Great Britain | + 0.69″ |
| 13 | Lucas Búa | Spain | + 0.72″ |
| 14 | Davide Re | Italy | + 0.77″ |
| 15 | Janis Leitis | Latvia | + 0.77″ |
| 16 |  Pavel Maslak | Czech Republic | + 0.83″ |
| 17 | Dylan Borlee | Belgium | + 0.87″ |
| 18 | Donald Blair-Sanford | Israel | + 0.92″ |
| 19 | Martyn Rooney | Great Britain | + 0.97″ |
| 20 | Lukasz Krawczuk | Poland | + 1.02″ |
| 21 | Samuel García | Spain | + 1.11″ |
| 22 | Vitaliy Butrym | Ukraine | + 1.25″ |
| 23 | Robert Parge | Romania | + 1.31″ |
| 24 | Patrick Schneider | Germany | + 1.82″ |