EVENT 103 Mens Open 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 3 | 1 | Thomas Speed | 99 | Bo Barnsley | 1:06.98 |
| 4 | 3 | Oliver Taverner | 01 | Mt Kelly | 1:06.98 |
| 5 | 2 | Liam Bollands | 99 | Middlesboro | 1:06.98 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 5 | Hugh Takemoto | 99 | Warrington W | 1:06.93 |
| 2 | 7 | Joshua Pemberton | 00 | Derventio | 1:06.73 |
| 3 | 9 | Craig Barnes | 98 | Sth Ayrshire | 1:06.72 |
| 4 | 11 | James McFadzen | 99 | Wycombe Dist | 1:06.58 |
| 5 | 10 | Benjamin Lawton | 99 | Aquae Sulis | 1:06.69 |
| 6 | 8 | Connor Bryan | 00 | Co Oxford | 1:06.73 |
| 7 | 6 | William Ritchie | 98 | Preston | 1:06.88 |
| 8 | 4 | James Millar | 98 | Portsmouth N | 1:06.96 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 13 | Cian Senior | 98 | Co Sheffield | 1:06.45 |
| 2 | 15 | George Clough | 99 | Warrender Ba | 1:06.07 |
| 3 | 17 | Jake Dixon | 98 | Co Birm'ham | 1:05.96 |
| 4 | 19 | Yaron Gerber | 98 | Barnet Copt | 1:05.88 |
| 5 | 18 | Joshua Lawson | 99 | Millfield | 1:05.88 |
| 6 | 16 | Joshua Thompson | 98 | Carnforth | 1:06.04 |
| 7 | 14 | Jack Blair | 98 | Chesterfield | 1:06.36 |
| 8 | 12 | Gregory Butler | 00 | Co Derby | 1:06.48 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 21 | Zak Aitchison | 98 | Millfield | 1:05.75 |
| 2 | 23 | Joseph Burrin | 98 | Newcastle | 1:05.66 |
| 3 | 25 | Callum McBeath | 98 | Forres | 1:05.36 |
| 4 | 27 | Chris Kerr | 93 | Warrender Ba | 1:04.54 |
| 5 | 26 | James Lewis | 98 | Co Cardiff | 1:04.87 |
| 6 | 24 | Jarvis Parkinson | 98 | Donc Dartes | 1:05.53 |
| 7 | 22 | Cameron Muir | 99 | Sth Ayrshire | 1:05.72 |
| 8 | 20 | Callum Smart | 00 | Co Oxford | 1:05.76 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 31 | Simon Smith | 85 | Stockport Mo | 1:03.95 |
| 2 | 37 | Luke Spain | 92 | Hillingdon | 1:02.64 |
| 3 | 43 | Calum Tait | 94 | Edinburgh Un | 1:01.35 |
| 4 | 49 | Craig Benson | 94 | UniOfStirl | 1:00.13 |
| 5 | 46 | Michael Jamieson | 88 | Edinburgh Un | 1:00.82 |
| 6 | 40 | Richard Spoor | 92 | Loughboro Un | 1:02.40 |
| 7 | 34 | Luke Davies | 97 | Co Birm'ham | 1:03.17 |
| 8 | 28 | Kevin Wallbank | 96 | Loughboro Un | 1:04.43 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 32 | Kieren Preston | 97 | Edinburgh Un | 1:03.74 |
| 2 | 38 | Euan Inglis | 93 | Edinburgh Un | 1:02.55 |
| 3 | 44 | Andrew Willis | 90 | Bath Univ | 1:00.87 |
| 4 | 50 | Ross Murdoch | 94 | UniOfStirl | 59.09 |
| 5 | 47 | Zachary Hayden | 87 | Wolverine | 1:00.71 |
| 6 | 41 | Charlie Attwood | 97 | Bath Univ | 1:01.68 |
| 7 | 35 | Jamie Graham | 93 | UniOfStirl | 1:03.10 |
| 8 | 29 | Tristan Slater | 93 | Millfield | 1:04.23 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 33 | Edward Baxter | 98 | Cockermouth | 1:03.54 |
| 2 | 39 | Robert Holderness | 90 | Millfield | 1:02.52 |
| 3 | 45 | Christopher Steeples | 92 | Co Manch Aq | 1:00.86 |
| 4 | 51 | Adam Peaty | 94 | Co Derby | 57.92 |
| 5 | 48 | James Wilby | 93 | Loughboro Un | 1:00.28 |
| 6 | 42 | Lawrence Palmer | 92 | Putteridge | 1:01.42 |
| 7 | 36 | David Murphy | 98 | Co Oxford | 1:02.84 |
| 8 | 30 | Edmund Ashton | 98 | London Aquat | 1:04.17 |