| # | Swimmer | Team | Seed | Time | Diff |
| 1 |
Benbekhti, Yanis Y (11)
|
FGRANS |
51.80 |
31.04 |
-20.76 |
| 2 |
Roca, Peter M (12)
|
FGEA |
30.02 |
31.33 |
1.31 |
| 3 |
Tovar, Sebastian R (12)
|
UNAT |
35.37 |
35.97 |
0.60 |
| 4 |
Lopez, Adam M (12)
|
FGNMST |
39.90 |
37.20 |
-2.70 |
| 5 |
Wilson, Nicholas J (11)
|
FGCANE |
37.58 |
37.64 |
0.06 |
| 6 |
Marques, Mateo (12)
|
FGMBS |
44.09 |
41.25 |
-2.84 |
| 7 |
De Angulo, Christopher W (11)
|
FGMS |
49.78 |
42.62 |
-7.16 |
| 8 |
Romero, Fernando (12)
|
FGASC |
48.19 |
43.30 |
-4.89 |
| 9 |
Garcia, Isaac N (12)
|
FGMACM |
|
43.75 |
- |
| 10 |
Serhiienko, Vladyslav (12)
|
FGMSAT |
|
48.26 |
- |
| 11 |
Arias, Alexander B (12)
|
FGAJSC |
|
59.96 |
- |
|
Guillaume, Micael A (11)
|
FGMACM |
1:00.27 |
NS |
- |
|
Kolotov, Konstantin (11)
|
FGMSAT |
|
NS |
- |