400m Boys Final B ; Official result since 18:27
| Rank | Lane | ID | Name | PB | Team | Cat | Result | Info | Video |
| 1 | 3 | 113 | Jezek David | Brno | 52.51 | ||||
| 2 | 4 | 186 | Turinek Tomaz | Velenje | 53.09 | ||||
| 3 | 2 | 197 | Liu Yi Chun | Taipei | 53.21 | ||||
| 4 | 5 | 109 | Skorjanc Dominik | Osijek | 53.87 | ||||
| 5 | 6 | 137 | Fridman Tal | Beer Sheva | 54.43 | ||||
| 6 | 8 | 111 | Skrtic Mislav | Osijek | 55.04 | ||||
| 7 | 1 | 102 | Webber Bryce | Lake Macquarie | 57.14 | ||||
| 7 | 168 | Cisir Martin | Bratislava | DNS |