| # | Swimmer | Team | Seed | Time | Diff |
| 1 |
Olsson, Kian J (14)
|
MRNDAC |
49.57 |
49.18 |
-0.39 |
| 2 |
Courtney, Benjamin B (14)
|
MRSSL |
50.69 |
51.40 |
0.71 |
| 3 |
Speare, Troy D (14)
|
MRNDAC |
51.96 |
51.58 |
-0.38 |
| 4 |
Crowley, Mason C (13)
|
MRNDAC |
53.15 |
53.68 |
0.53 |
| 5 |
Lam, Vernon J (14)
|
MRYBAR |
54.95 |
56.53 |
1.58 |
| 6 |
Pociask, Joseph V (14)
|
MRNDAC |
58.24 |
56.56 |
-1.68 |
| 7 |
Frankl, Erik A (13)
|
MRNBS |
1:05.48 |
1:06.58 |
1.10 |
| 8 |
Vinas, Avery T (13)
|
MRSSL |
1:19.19 |
1:06.77 |
-12.42 |
| 9 |
Tarife, Grey P (13)
|
MRSSL |
1:21.13 |
1:09.22 |
-11.91 |
| 10 |
Wik, Aaden P (13)
|
MRPATS |
|
1:10.67 |
- |
| 11 |
LoPresti, Pietro R (13)
|
MRMWDA |
1:20.89 |
1:14.10 |
-6.79 |
| 12 |
Howard, Sam W (13)
|
MRRFAC |
1:14.30 |
1:14.58 |
0.28 |
| 13 |
Dorner, Declan M (13)
|
MRNDAC |
1:17.80 |
1:16.18 |
-1.62 |
| 14 |
Corrado, John Caleb E (13)
|
MRMWDA |
1:16.40 |
1:16.29 |
-0.11 |
|
Cramer, Aaron Z (13)
|
MRSSL |
|
DQ |
- |