| # | Swimmer | Team | Seed | Time | Diff |
| 1 |
Mansur, Marcelo (12)
|
FGMACM |
28.70 |
28.14 |
-0.56 |
| 2 |
Roca, Peter M (11)
|
FGEA |
30.16 |
29.51 |
-0.65 |
| 3 |
Pallin, Ricardo (12)
|
FGASC |
|
29.90 |
- |
| 4 |
Campoo, Luciano J (12)
|
FGSDST |
30.38 |
30.34 |
-0.04 |
| 5 |
Murdocca, Matteo M (12)
|
FGEA |
32.86 |
31.94 |
-0.92 |
| 6 |
Gonzalez, Santiago A (12)
|
FGCM |
32.19 |
33.19 |
1.00 |
| 7 |
Ferrari, Anthony G (12)
|
FGMBS |
33.35 |
33.41 |
0.06 |
| 8 |
Quintana, Jaime (12)
|
FGSOFL |
39.04 |
33.99 |
-5.05 |
| 9 |
Plokhotnichenko, Ernest (11)
|
FGEA |
33.12 |
34.03 |
0.91 |
| 10 |
Arias, Adrian (11)
|
FGASC |
34.31 |
34.60 |
0.29 |
| 11 |
Juodzevicius, Joel (11)
|
FGCM |
34.95 |
35.02 |
0.07 |
| 12 |
Choque, Thomas A (11)
|
FGMBS |
|
35.64 |
- |
| 13 |
Otero, Ayden A (11)
|
FGMACM |
37.06 |
35.92 |
-1.14 |
| 14 |
Charnov, Maksim (11)
|
FGMSAT |
|
36.27 |
- |
| 15 |
Canellas, Kai (12)
|
FGMCDA |
|
37.11 |
- |
| 16 |
Esser, Erick (11)
|
FGSOFL |
38.51 |
37.42 |
-1.09 |
| 17 |
Perdigon, Julien A (12)
|
FGSOFL |
|
41.94 |
- |
| 18 |
Gomez, Adrian (12)
|
FGASC |
41.39 |
42.23 |
0.84 |
| 19 |
Fachetti-Carvhalo, Gabriel (11)
|
FGASC |
47.02 |
45.86 |
-1.16 |
| 20 |
Ramirez, Juan-Esteban (12)
|
FGSOFL |
45.88 |
46.32 |
0.44 |
| 21 |
Szulc, Dante (11)
|
FGMCDA |
|
49.41 |
- |
|
Singh, Aarin (11)
|
FGMCDA |
38.09 |
NS |
- |
|
Salazar, Emiliano (11)
|
FGMACM |
|
NS |
- |
|
Aball, Miguel (11)
|
FGASC |
|
NS |
- |