400m BOYS FINAL ; Official result since 18:16
| Rank | Lane | ID | Name | SB | Team | Cat | Result | Info | Video |
| 1 | 6 | 34 | DOOM Alexander | 49"03 | BEL | Youth | 47.93 | ||
| 2 | 4 | 110 | VEDEL Benjamin Lobo | 48"69 | DEN | Youth | 48.37 | ||
| 3 | 7 | 382 | MORARU Zeno | 49"58 | ROU | Youth | 49.09 | ||
| 4 | 3 | 337 | BLUEKENS Timothy | 49"41 | NED | Youth | 49.32 | ||
| 5 | 5 | 417 | ZUPANC Anej | 49"46 | SLO | Youth | 49.75 | ||
| 6 | 2 | 405 | SKREBNEV Nikolai | 50"29 | RUS | Youth | 50.43 | ||
| 7 | 1 | 497 | POLISHCHUK Renat | 50"32 | UKR | Youth | 50.59 | ||
| 8 | 8 | 72 | STOYANOV Zhivko | 50"82 | BUL | Youth | 51.43 |