400m National AC Men, Heat:1 of 4 ; Official result since 19:05
| Rank | Lane | ID | Name | PB | Team | Cat | Result | Info | Video |
| 1 | 8 | 38 | LEONARD NICOLAS | BBS | Sch | 55.35 | |||
| 2 | 4 | 120 | VIERENDEELS MATTHIAS | SMAC | Sen | 56.04 | |||
| 3 | 5 | 101 | FICHER PIERRE | HERV | Sen | 56.80 | |||
| 4 | 7 | 102 | HOVETTE LUCAS | FRA | Sen | 57.22 | |||
| 5 | 2 | 96 | CLAESEN ARON | ATLA | Cad | 58.11 | |||
| 6 | 6 | 104 | JAMME MARTIN | RFCL | Jun | 58.53 | |||
| 7 | 3 | 113 | ROUSSEAU NICOLAS | CABW | Cad | 59.25 |