400m BOYS , Heat:1 of 2 ; Official result since 18:15
| Rank | Lane | ID | Name | SB | Team | Cat | Result | Info | Video |
| 1 | 6 | 110 | VEDEL Benjamin Lobo | 48.69 | DEN | Youth | 48.92 | Q | |
| 2 | 4 | 337 | BLUEKENS Timothy | 50.58 | NED | Youth | 49.41 | Q | |
| 3 | 7 | 382 | MORARU Zeno | 49.58 | ROU | Youth | 49.61 | Q | |
| 4 | 5 | 405 | SKREBNEV Nikolai | 51.15 | RUS | Youth | 50.29 | q | |
| 5 | 2 | 497 | POLISHCHUK Renat | 50.39 | UKR | Youth | 50.32 | q | |
| 6 | 3 | 303 | KOLENDA Ernest | 51.18 | LTU | Youth | 51.90 | ||
| 7 | 8 | 280 | KARPINSKIS Austris | 50.10 | LAT | Youth | 51.92 |