| Name | Event | Round | Time | Imp | |
|---|---|---|---|---|---|
| 1 | Francois Du Plessis | 100 L Back | Prelims | 1:06.29 | – |
| 2 | Alje Van Deemter | 100 L Back | Prelims | 1:03.27 | – |
| 3 | Willem Roos | 100 L Back | Prelims | 1:10.88 | – |
| 4 | Darno Merwe | 100 L Back | Prelims | 1:07.91 | – |
| 5 | Keenan Clark | 100 L Back | Prelims | 1:07.12 | +2.1% |
| 6 | Johnlouis Landskron | 100 L Back | Prelims | 1:04.18 | – |
| 7 | Ethan Riekert | 100 L Back | Prelims | 1:02.01 | – |
| 8 | Logan Truter | 100 L Back | Prelims | 1:06.56 | +1.3% |
| 9 | Jonathan Heslop | 100 L Back | Prelims | 1:07.54 | – |
| 10 | Caelan Hill | 100 L Back | Prelims | 1:06.03 | – |
