400 m Nat. Hommes, Heat:1 of 3 ; Official result since 18:43
| Rank | Lane | ID | Name | PB | Team | Cat | Result | Info | Video |
| 1 | 4 | 727 | BAYARD JULIEN | 54.87 | BEL | Sen | 53.09 | ||
| 2 | 3 | 300 | CIORNEI LOUIS | 55.65 | BEL | Jun | 55.32 | ||
| 3 | 7 | 5604 | GIARDINI MATTEO | 55.70 | BEL | Cad | 55.38 | ||
| 4 | 2 | 63 | OFOUYA IGONDA MESSIE | 56.02 | BEL | Jun | 55.39 | ||
| 5 | 6 | 1211 | KHIYARA RAYAN | 55.57 | BEL | Sen | 55.72 | ||
| 6 | 5 | 6633 | HAYYEN RAYAN | 55.39 | BEL | Sch | 55.95 | ||
| 7 | 8 | 2308 | KLARZYNSKI DANIEL | 57.55 | BEL | Mas | 57.85 | ||
| 8 | 1 | 9001 | TURZA MICHAEL | 59.44 | AUT | Mas | 1:00.40 |