EVENT 104 Open/Male 12/13 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Max Young | 13 | Cornwall | 1:27.29 |
| 2 | 3 | Riley Hamer | 13 | Lincolnshire | 1:24.53 |
| 3 | 5 | Noah Bielby | 13 | Northants | 1:22.81 |
| 4 | 7 | Joseph Tsz Wai To | 13 | Ox & N Bucks | 1:21.50 |
| 5 | 6 | James Nightingale | 13 | Leics | 1:21.61 |
| 6 | 4 | Luke Owens | 13 | Bedfordshire | 1:23.47 |
| 7 | 2 | Isaac Pealin | 13 | Shropshire | 1:26.26 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 9 | Gethin Jenks | 13 | Wiltshire | 1:20.12 |
| 1 | 11 | Cameron Jolly | 13 | Scot North | 1:18.79 |
| 2 | 13 | Kieran Ng | 13 | Cambs | 1:16.64 |
| 3 | 15 | Oscar Jakeways | 13 | Gloucs | 1:16.44 |
| 4 | 17 | Harry Meakin | 13 | Staffs | 1:09.43 |
| 5 | 16 | Tyler Stone | 13 | Norfolk | 1:12.79 |
| 6 | 14 | Finley Phillips | 13 | SW Wales | 1:16.62 |
| 7 | 12 | Rocco Wilson | 13 | Cumbria | 1:18.51 |
| 8 | 10 | Harry Silvey | 13 | Dorset | 1:18.85 |
| 9 | 8 | Mir Al-Dabak | 13 | Cheshire | 1:20.69 |