400m Nat. Hommes, Heat:1 of 2 ; Official result since 18:48
| Rank | Lane | ID | Name | PB | Team | Cat | Result | Info | Video |
| 1 | 4 | 85 | CORTES LECLOU AMADEO | 50.73 | BEL | Sch | 51.64 | ||
| 2 | 6 | 88 | MOSSADEQ RAYAN | 51.86 | BEL | Sen | 52.02 | ||
| 3 | 5 | 87 | LEONARD NICOLAS | 51.15 | BEL | Sen | 52.20 | ||
| 4 | 7 | 94 | VANGEEBERGEN HUGO | 52.89 | BEL | Jun | 52.47 | ||
| 5 | 3 | 86 | LALOUX PIERRE | 52.25 | BEL | Sen | 52.75 |