400 meter U20 Men - Heats, Heat:1 of 3 ; Official result since 19:11
| Rank | Lane | ID | Name | PB | Team | Cat | Result | Info | Video |
| 1 | 3 | 1162 | SESHOKA KAGO | BOT | U20 | 46.50 | Q | ||
| 2 | 5 | 1543 | CHEMELIL ELKANAH KIPROTICH | KEN | U20 | 47.00 | Q | ||
| 3 | 2 | 1115 | CALEB JOSHUA | NGR | U20 | 47.60 | q | ||
| 4 | 1 | 1449 | FULUMAKA HENRY | ZAM | U20 | 48.60 | |||
| 4 | 1277 | JARAVAZI TAYEDZA SHANGAI | ZIM | U20 | DNS | ||||
| 6 | 1336 | KANANGILA TSHIBAMBA DESIRE | COD | U20 | DNS |