400 meter u23 Men, Heat:1 of 2 ; Official result
| Rank | Lane | ID | Name | PB | Team | Cat | Result | Info | Video |
| 1 | 5 | 10 | HANEKOM, Lindsay | BAK | u23 | 50.81 | Q | ||
| 2 | 3 | 1434 | HENDRICKS, Herschelle | BELL | u23 | 50.98 | Q | ||
| 3 | 7 | 179 | FRANS, Duncan | BAK | u23 | 51.10 | Q | ||
| 4 | 4 | 502 | NICHOLLS, Rowan | UCT | u23 | 54.15 | q | ||
| 5 | 6 | 196 | AFRIKA, Andre | EAC | u23 | 55.41 | |||
| 2 | 1433 | RUITERS, Keanan | BELL | u23 | DNS |