EVENT 107 Open/Male 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 2 | Oscar STEVENS | 11 | Chesterfield | 1:27.00 |
| 2 | 4 | Aaryamaan SINGH | 08 | Swindon Dolp | 1:20.66 |
| 3 | 6 | Mir AL-DABAK | 10 | Stockport Mo | 1:19.80 |
| 4 | 8 | Henry SCULLY-PROUD | 07 | Loughborough | 1:17.04 |
| 5 | 7 | Hayden HUDSON | 10 | Chesterfield | 1:19.60 |
| 6 | 5 | Gethin JENKS | 10 | Swindon Dolp | 1:20.12 |
| 7 | 3 | Ethelbert HEMS GILLSON | 08 | Repton | 1:25.10 |
| 8 | 1 | Mykhailo UNIIAT | 09 | Swindon Dolp | 1:27.93 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 10 | Sam MACER | 08 | Repton | 1:14.80 |
| 2 | 12 | Ellis BANCROFT | 08 | Loughborough | 1:14.40 |
| 3 | 14 | Jack BROWN | 07 | Soundwell | 1:11.76 |
| 4 | 16 | Jack COLLINS | 08 | Co Sheffield | 1:09.80 |
| 5 | 15 | Cole STEVENS | 07 | Chesterfield | 1:10.20 |
| 6 | 13 | Las AL-DABAK | 08 | Stockport Mo | 1:13.72 |
| 7 | 11 | Harrison BYWATER | 07 | Loughborough | 1:14.63 |
| 8 | 9 | Giorgio OXBY | 05 | Stockport Mo | 1:15.34 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 20 | Ross TURNER | 80 | Rugby | 1:08.33 |
| 2 | 26 | Freddie CARTER | 06 | Swindon Dolp | 1:04.20 |
| 3 | 32 | Luis WEEKES | 00 | Bath Univ | 1:02.38 |
| 4 | 38 | Ryan GRIFFITHS | 03 | Co Sheffield | 1:00.60 |
| 5 | 35 | Oliver KETTLE | 04 | Bath Univ | 1:01.90 |
| 6 | 29 | Michael EDWARDS | 04 | Mid Sussex | 1:02.90 |
| 7 | 23 | Thomas WILKINSON | 06 | Chesterfield | 1:06.00 |
| 8 | 17 | Thomas O'BRIEN | 08 | Stockport Mo | 1:09.50 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 21 | Lucas CARTER | 08 | Swindon Dolp | 1:07.10 |
| 2 | 27 | Christian RYAN | 05 | Bath Univ | 1:03.70 |
| 3 | 33 | Mackenzie CANNON | 02 | Lboro Uni | 1:02.30 |
| 4 | 39 | Alex CASEY | 04 | Loughboro Un | 1:00.40 |
| 5 | 36 | Jack BLAIR | 98 | Chesterfield | 1:01.62 |
| 6 | 30 | Oliver TAVERNER | 01 | Loughboro Un | 1:02.80 |
| 7 | 24 | Ethan ELLIS-SIXSMITH | 03 | Co Sheffield | 1:05.70 |
| 8 | 18 | Hao Hao SHI | 09 | Co Sheffield | 1:09.40 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 22 | Luke JONES | 05 | Bromsgrove | 1:06.70 |
| 2 | 28 | William GODSELL | 05 | Bath Univ | 1:03.13 |
| 3 | 34 | Rohan SMITH | 04 | Co Sheffield | 1:02.10 |
| 4 | 40 | Eoin CORBY | 01 | NC Dublin | 58.43 |
| 5 | 37 | Harvey FREEMAN | 04 | Loughboro Un | 1:00.80 |
| 6 | 31 | Sam WILLIAMSON | 04 | Bath Univ | 1:02.70 |
| 7 | 25 | William DEAN | 05 | Bath Univ | 1:04.80 |
| 8 | 19 | Willem MUDDIMER | 05 | Loughborough | 1:08.91 |