EVENT 303 Open/Male 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 3 | 3 | Thomas Dale | 14 | | Warrington W | |
| 4 | 6 | Joe Chadwick | 14 | | Aquabears | |
| 5 | 5 | Daniel French | 14 | | Wirral Metro | |
| 6 | 2 | Cheuk Hei Li | 13 | | Trafford Met | |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 8 | Dylan Gregory | 14 | | Co Liverpool | |
| 2 | 10 | Markus Symonds | 16 | | Wigan BEST | |
| 3 | 12 | Jacob Baker | 14 | | Aquabears | |
| 4 | 16 | William Carter | 16 | | Bury & Elton | |
| 5 | 15 | Gus Fraser | 14 | | Winsford | |
| 6 | 11 | Benji Sutcliffe | 14 | | Ramsbottom | |
| 7 | 9 | Tyler Barber | 13 | | Co Manch Aq | |
| 8 | 7 | Oscar Maddrell | 13 | | Io Man | |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 18 | Lewis Cooper | 15 | | Cockermouth | |
| 2 | 20 | Matthew Foley | 16 | | Ulverston | |
| 3 | 22 | Max Henderson | 17 | | Cockermouth | 58.83 |
| 4 | 25 | Cole Hood | 15 | | Wigan BEST | |
| 5 | 24 | Daniel Saunders | 16 | | Blackburn | |
| 6 | 21 | Cain Ashton | 15 | | Stockport Mo | |
| 7 | 19 | Logan Warburton | 16 | | Preston | |
| 8 | 17 | Owen Donnelly | 16 | | Clitheroe | |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 29 | Adam Frost | 30 | | Satellite | |
| 2 | 35 | Elliott Hughes | 15 | | Trafford Met | 59.35 |
| 3 | 41 | Mackinlay Houghton | 21 | | Halton | 59.36 |
| 4 | 47 | Oliver Parry | 17 | | Ramsbottom | 58.13 |
| 5 | 44 | Jack Jarvis | 17 | | Co Manch Aq | 58.70 |
| 6 | 38 | Luke Brussels | 17 | | Warrington W | 58.75 |
| 7 | 32 | Rares Achim | 16 | | Co Liverpool | |
| 8 | 26 | Ben Stephenson | 14 | | Wirral Metro | |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 30 | Luke Horton | 18 | | Carnforth | |
| 2 | 36 | Toby Hill | 21 | | Co Manch Aq | 58.71 |
| 3 | 42 | Patrick Harriman | 16 | | Satellite | 57.48 |
| 4 | 48 | Lachlan Beazley | 18 | | Co Manch Aq | 58.48 |
| 5 | 45 | Owen Wilson | 16 | | Ramsbottom | 57.75 |
| 6 | 39 | Callum Mongan | 18 | | Aquabears | 59.33 |
| 7 | 33 | Joseph Ball | 17 | | Preston | 58.77 |
| 8 | 27 | Michael Gillespie | 17 | | Stockport Mo | |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 31 | Joshua Hayes | 17 | | Wigan BEST | 59.49 |
| 2 | 37 | Nathan Young | 26 | S15 | Stockport Mo | 58.49 |
| 3 | 43 | Kyle Durand | 20 | | Aquabears | 56.77 |
| 4 | 49 | Zac Cooper | 18 | | Co Manch Aq | 57.87 |
| 5 | 46 | Fergus Bell | 17 | | Ulverston | 57.42 |
| 6 | 40 | Berdan Ordek | 17 | | Co Liverpool | |
| 7 | 34 | Oscar Hodgson | 16 | | Cockermouth | 59.21 |
| 8 | 28 | Thomas Binns | 18 | | Burnley BOBC | 58.28 |