Men's 400m Hurdles Semi-Final 2
dimanche 1 août 2021, 12h15 GMT – 17h15 GMT
| Nom | Temps | |
|---|---|---|
| 1 |  Alison dos Santos | 47.31″ |
| 2 |  Abderrahman Samba | + 0.16″ |
| 3 |  Alessandro Sibilio | + 0.62″ |
| 4 |  Kenneth Selmon | + 1.27″ |
| 5 |  Luke Campbell | + 1.31″ |
| 6 |  Shawn Rowe | + 1.52″ |
| 7 |  Nick Smidt | + 2.04″ |
| 8 |  Vit Muller | + 2.38″ |