400mH BOYS , Heat:1 of 2 ; Official result since 15:28
| Rank | Lane | ID | Name | SB | Team | Cat | Result | Info | Video |
| 1 | 5 | 351 | GALIKOWSKI Michal | 53"94 | POL | Youth | 53.99 | Q | |
| 2 | 3 | 359 | PRAZERES NETO Paulo | 54"16 | POR | Youth | 55.00 | Q | |
| 3 | 7 | 205 | LEVANTINOS Dimitris | 54"46 | GRE | Youth | 55.24 | Q | |
| 4 | 2 | 96 | SKLENAR David | 55"98 | CZE | Youth | 55.72 | q | |
| 5 | 4 | 138 | MOLDAU Martin | 56"12 | EST | Youth | 56.83 | ||
| 6 | 8 | 285 | SINCUKOVS Maksims | 58"27 | LAT | Youth | 57.22 | ||
| 7 | 6 | 476 | TEKAL Yasin | 57"88 | TUR | Youth | 59.17 |