| # | Swimmer | Team | Seed | Time | Diff |
| 1 |
Lowe, Dalton D (16)
|
GUSST |
49.14 |
51.19 |
2.05 |
| 2 |
Baskett, Walter R (18)
|
GUSSAN |
50.20 |
53.20 |
3.00 |
| 3 |
Saria, Noah D (15)
|
GUTYES |
55.41 |
59.34 |
3.93 |
| 4 |
Mora, Alejandro M (16)
|
GUTYES |
59.92 |
1:00.01 |
0.09 |
| 5 |
Martino, Henrique C (17)
|
GUSSAN |
53.98 |
1:00.37 |
6.39 |
| 6 |
Ward, Owen M (15)
|
GUSSAN |
1:04.38 |
1:02.21 |
-2.17 |
| 7 |
McWhorter, Alexander G (15)
|
GUTYES |
1:07.57 |
1:04.36 |
-3.21 |
| 8 |
Garza, Vincent (15)
|
GUSSAN |
1:03.33 |
1:05.50 |
2.17 |
| 9 |
Moon-Puente, Kalvin G (18)
|
GUTYES |
1:13.24 |
1:07.26 |
-5.98 |
|
Irwin, Hunter E (16)
|
GUSSAN |
1:12.52 |
NS |
- |