| # | Swimmer | Team | Seed | Time | Diff |
| 1 |
Rendon, Adrian O (10)
|
FGMWA |
39.68 |
38.88 |
-0.80 |
| 2 |
Linares, Jesus D (10)
|
FGMACM |
41.70 |
39.02 |
-2.68 |
| 3 |
Park, Brandon (10)
|
FGMWA |
50.38 |
41.21 |
-9.17 |
| 4 |
Fothergill, Liam (10)
|
FGMWA |
45.47 |
44.60 |
-0.87 |
| 5 |
Remmelo, Max (10)
|
FGYSF |
|
45.76 |
- |
| 6 |
Romeo, Lucas J (10)
|
FGMACM |
45.77 |
46.24 |
0.47 |
| 7 |
Lozano, Julian (10)
|
FGGRSC |
1:00.66 |
47.04 |
-13.62 |
| 8 |
Negrin, Axel (10)
|
FGGRSC |
46.74 |
47.58 |
0.84 |
| 9 |
Escoto, Alejandro J (10)
|
FGGRSC |
45.30 |
48.02 |
2.72 |
| 10 |
Crespo, Alejandro D (10)
|
FGMACM |
|
48.05 |
- |
| 11 |
Corte Hernandez, Gabriel A (10)
|
FGMWA |
55.24 |
48.45 |
-6.79 |
| 12 |
Guio, Santiago (9)
|
FGMWA |
51.33 |
49.00 |
-2.33 |
| 13 |
Musiello, Bernardo P (10)
|
FGGRSC |
45.94 |
49.31 |
3.37 |
| 14 |
Vega, Braison (9)
|
FGUN-0 |
|
49.86 |
- |
| 15 |
Barnett, Chace (10)
|
FGYSF |
54.30 |
50.71 |
-3.59 |
| 16 |
Hampton, Trent D (9)
|
FGGRSC |
58.94 |
54.17 |
-4.77 |
| 17 |
Lenz Cesar, Guilherme B (9)
|
FGGRSC |
|
58.24 |
- |
| 18 |
Casas, Mateo (10)
|
FGMWA |
1:09.41 |
1:02.41 |
-7.00 |
| 19 |
Antonova, Oleksandr (9)
|
FGPST |
|
1:10.79 |
- |
|
Ives, Matthew S (10)
|
FGYSF |
1:03.40 |
NS |
- |