Mens 17/18 Yrs 100m Breaststroke - Semi Final
Full Results
| Place | Name | AaD | Club | | Time | | R.T. | FINA Pt | | 50 |
| 1. | Adam Peaty | 18 | Co Derby | | 59.92GBRAG | | + 0.65 | 928 | | 28.34 |
| 2. | Alexander Murphy | 18 | AbingdonVale | | 1:03.19 | | + 0.67 | 791 | | 30.18 |
| 3. | Harry Ackland | 17 | Plymouth Lea | | 1:04.22 | | + 0.62 | 754 | | 30.32 |
| 4. | Daniel Lim | 17 | Warrender Ba | | 1:04.38 | | + 0.71 | 748 | | 30.36 |
| 5. | Ryan Flanagan | 18 | Co Leeds | | 1:04.48 | | + 0.75 | 745 | | 30.05 |
| 6. | Jack Burton | 17 | Plymouth Lea | | 1:05.16 | | + 0.67 | 722 | | 30.59 |
| 7. | Jack Smith | 17 | Millfield | | 1:05.34 | | + 0.67 | 716 | | 30.83 |
| 8. | Benjamin Stuckey | 18 | Bo Newham | | 1:05.79 | | + 0.73 | 701 | | 30.53 |
| 9. | Joshua Winnicott | 17 | Co Birm'ham | | 1:05.82 | | + 0.70 | 700 | | 30.87 |
| 10. | Max Hewett | 18 | Havant & Wat | | 1:05.99 | | + 0.72 | 695 | | 31.19 |
| 11. | Paul Angus | 17 | IRL-Ulster | | 1:06.51 | | + 0.74 | 679 | | 31.16 |
| 12. | Roy Sterling | 18 | Swim Conwy | | 1:06.89 | | + 0.65 | 667 | | 30.99 |
| 13. | Harry James | 17 | AbingdonVale | | 1:07.15 | | + 0.74 | 659 | | 31.38 |
| 14. | Dominic Holloway | 17 | Woking | | 1:07.16 | | + 0.75 | 659 | | 31.56 |
| 15. | Louis Oliver | 17 | Co Birm'ham | | 1:07.25 | | + 0.68 | 656 | | 30.97 |
| 16. | Roger Dawson | 17 | IRL-Ulster | | 1:07.29 | | + 0.67 | 655 | | 31.45 |
| 17. | Paul Achkar | 17 | Chelsea&West | | 1:07.35 | | + 0.77 | 653 | | 31.84 |
| 18. | Kyle Borley | 18 | Derwentside | | 1:07.53 | | + 0.83 | 648 | | 31.60 |
| 19. | Ben Griffin | 17 | IRL | | 1:07.79 | | + 0.68 | 641 | | 31.33 |
| | George Finch | 18 | Maxwell | | DQ | | | | | |
