400m U20 Men, Heat:4 of 7 ; Official result since 16:43
| Rank | Lane | ID | Name | PB | Team | Cat | Result | Info | Video |
| 1 | 8 | 263 | Martin MUDONGO | TATI | JUN | 50.10 | |||
| 2 | 1 | 668 | Thobo SERAME | JAC | JUN | 51.04 | |||
| 3 | 5 | 107 | Taolo Kgalalelo | CSE | JUN | 51.77 | |||
| 4 | 7 | 259 | Thero MATETE | TATI | JUN | 51.80 | |||
| 5 | 4 | 106 | Batsile Machuka | CSE | JUN | 53.23 | |||
| 6 | 3 | 629 | Lepang RALETHOTHO | KGAL | JUN | 1:00.19 | |||
| 2 | 450 | Meterere NDJARAKANA | NJSS | JUN | DNS | ||||
| 6 | 211 | Mbakiso Chinambe | SPAC | JUN | DNS |
