400m Nat. Hommes, Heat:3 of 4 ; Official result since 18:32
| Rank | Lane | ID | Name | PB | Team | Cat | Result | Info | Video |
| 1 | 4 | 9055 | ENSLIN JOHAN | 49.16 | RSA | Jun | 49.12 | ||
| 2 | 5 | 9100 | DAUDE KILIAN | 49.32 | FRA | Sen | 49.35 | ||
| 3 | 6 | 2213 | BOUCHAT ARTHUR | 49.50 | BEL | Sen | 50.30 | ||
| 4 | 3 | 1476 | KAPENDA NATHAN | 50.15 | BEL | Sen | 51.31 | ||
| 5 | 2 | 88 | RYSENAER BAPTISTE | 50.40 | BEL | Jun | 51.40 | ||
| 7 | 1875 | SCARNIET FRANCOIS | 50.29 | BEL | Sen | DNS |