EVENT 20 Open/Male 100m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 1 | Dylan JORDAN | 14 | Weymouth | 1:59.25 |
| 2 | 3 | Griffin WALL | 14 | Seagulls SC | 1:54.78 |
| 3 | 5 | Seth NORQUOY | 13 | Poole | 1:44.81 |
| 4 | 4 | Charlie GIRLING | 13 | Bourmth Coll | 1:50.46 |
| 5 | 2 | Archie WHITELEY | 15 | Bourmth Coll | 1:57.77 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 7 | Dexter MURRAY | 13 | Wareham | 1:42.00 |
| 2 | 9 | Louis DOBSON | 14 | Bourmth Coll | 1:36.22 |
| 3 | 11 | Jake HENDIN | 12 | Weymouth | 1:35.88 |
| 4 | 10 | Harrison HAN | 13 | S Bournem'th | 1:36.09 |
| 5 | 8 | Harry MORGAN | 13 | S Bournem'th | 1:39.02 |
| 6 | 6 | Franco HOWLETT | 15 | West Dorset | 1:42.91 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 13 | Oscar MACHTYLSKI | 15 | Poole | 1:34.83 |
| 2 | 15 | Micah LIVELY | 14 | Weymouth | 1:30.06 |
| 3 | 17 | Max PALMER | 14 | Poole | 1:29.33 |
| 4 | 16 | William BIRD | 13 | Poole | 1:29.41 |
| 5 | 14 | Wlliam GOOM | 15 | Weymouth | 1:31.00 |
| 6 | 12 | Stanley WEIGHELL | 15 | Seagulls SC | 1:35.37 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 19 | Charlie GREEN | 12 | S Bournem'th | 1:23.99 |
| 2 | 21 | Harry HENSHAW | 12 | West Dorset | 1:20.94 |
| 3 | 23 | Jenson LOWE | 12 | Poole | 1:16.55 |
| 4 | 22 | Reece EMERY | 12 | Blandford | 1:19.19 |
| 5 | 20 | George WILSON | 12 | West Dorset | 1:21.48 |
| 6 | 18 | Louie WAY | 12 | Weymouth | 1:26.10 |