| # | Swimmer | Team | Seed | Time | Diff |
| 1 |
Wilson, Evan (12)
|
FGMCDA |
32.34 |
30.67 |
-1.67 |
| 2 |
Campoo, Luciano J (12)
|
FGSDST |
32.48 |
32.04 |
-0.44 |
| 3 |
Pallin, Ricardo (12)
|
FGASC |
39.56 |
33.42 |
-6.14 |
| 4 |
Gonzalez, Santiago A (12)
|
FGCM |
38.88 |
39.85 |
0.97 |
| 5 |
Arias, Adrian (11)
|
FGASC |
39.54 |
42.22 |
2.68 |
| 6 |
Ferrari, Anthony G (12)
|
FGMBS |
47.20 |
44.10 |
-3.10 |
| 7 |
Choque, Thomas A (11)
|
FGMBS |
49.59 |
45.01 |
-4.58 |
| 8 |
Otero, Ayden A (11)
|
FGMACM |
|
46.00 |
- |
| 9 |
Szulc, Dante (11)
|
FGMCDA |
|
1:12.28 |
- |
|
Aball, Miguel (11)
|
FGASC |
|
DQ |
- |
|
Gomez, Adrian (12)
|
FGASC |
1:03.90 |
DQ |
- |
|
Charnov, Maksim (11)
|
FGMSAT |
|
DQ |
- |
|
Ramirez, Juan-Esteban (12)
|
FGSOFL |
1:03.08 |
DQ |
- |
|
Murdocca, Matteo M (12)
|
FGEA |
41.29 |
NS |
- |
|
Singh, Aarin (11)
|
FGMCDA |
1:01.08 |
NS |
- |