EVENT 303 Men Open 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 3 | 2 | Eber Meyer Clayton | 16 | | Stretford | 1:04.42 |
| 4 | 5 | Brandon Taylor | 14 | | Chorley Marl | 1:02.38 |
| 5 | 4 | Jaeden Lim | 15 | | Stretford | 1:04.37 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 2 | 7 | Berdan Ordek | 14 | | Warrington W | 1:02.79 |
| 3 | 9 | Oliver Parry | 14 | | Oldham Aqua | 1:02.05 |
| 4 | 12 | Johnny Gibbs | 16 | | Preston | DQ: . |
| 5 | 11 | Callum Mongan | 15 | | Aquabears | 1:02.26 |
| 6 | 8 | Leo Taylor | 16 | | Leyland Barr | 1:01.53 |
| 7 | 6 | Ethan Richards | 16 | | Aquabears | DN:C . |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 14 | Elliot Mitchell | 15 | | Oldham Aqua | 1:03.56 |
| 2 | 16 | Adam Wright | 16 | | Winsford | 1:01.45 |
| 3 | 18 | Emil Dawkins | 15 | | Preston | 1:02.53 |
| 4 | 20 | Luke Brussels | 14 | | Co Manch Aq | 1:02.36 |
| 5 | 19 | Luke Curnyn | 15 | | Co Liverpool | 1:02.53 |
| 6 | 17 | Oliver Crooks | 15 | | Bolton Metro | 1:03.13 |
| 7 | 15 | Daniel Haynes | 15 | | Wigan BEST | 1:04.08 |
| 8 | 13 | Daniel Jones | 16 | | Wigan BEST | 1:03.71 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 27 | Daniel Khodaverdi | 13 | | Stockport Mo | 1:01.12 |
| 2 | 34 | Kyle Durand | 17 | | Aquabears | 1:00.34 |
| 3 | 41 | Samuel Grimes | 16 | | Wigan BEST | 59.82 |
| 4 | 47 | Jolan Bennett | 19 | | Stockport Mo | 57.73 |
| 5 | 44 | Tom McCabe | 17 | | Stockport Mo | 57.77 |
| 6 | 37 | Tom Arkwright | 17 | | Leyland Barr | DN:C . |
| 7 | 31 | Charlie Collins | 16 | | Wigan BEST | DN:C . |
| 8 | 22 | Dylan Fung | 15 | | Stockport Mo | 1:02.09 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 29 | Joshua Morrison | 19 | | LiverpoolPen | DN:C . |
| 2 | 35 | Benjamin Haughton | 17 | | Co Manch Aq | 1:00.30 |
| 3 | 42 | Thomas Kud | 17 | | Winsford | 1:01.00 |
| 4 | 48 | Toby Hill | 18 | | Co Manch Aq | 57.95 |
| 5 | 45 | Matthew Haynes | 17 | | Wigan BEST | 59.69 |
| 6 | 38 | Luke Critchlow | 17 | | Stockport Mo | 58.85 |
| 7 | 32 | Samuel Sutcliffe | 13 | | Ramsbottom | 59.96 |
| 8 | 23 | James Escolme | 16 | | Carnforth | 1:02.73 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 30 | Joel Birtles | 16 | | Aquabears | 1:01.66 |
| 2 | 36 | Owen Whiteley | 16 | | Ramsbottom | 1:01.21 |
| 3 | 43 | Xuanming Guo | 15 | | Co Manch Aq | 58.84 |
| 4 | 49 | Joseph Stout | 17 | | Co Salford | 56.85 |
| 5 | 46 | Jake Reynolds | 18 | | Blackburn | 1:00.12 |
| 6 | 40 | James Handford | 18 | | Leyland Barr | 1:01.00 |
| 7 | 33 | Lewis Turner | 16 | | Winsford | 1:00.63 |
| 8 | 24 | Joseph Ashley | 14 | | Warrington W | 1:05.54 |