| # | Swimmer | Team | Seed | Time | Diff |
| 1 |
Jones, Jake F (10)
|
FGPCS |
37.26 |
35.85 |
-1.41 |
| 2 |
Broad, Lincoln (10)
|
FGMS |
|
36.67 |
- |
| 3 |
Lin, Christopher T (10)
|
FGPCS |
36.70 |
36.94 |
0.24 |
| 4 |
Santos, Kevin T (10)
|
FGPCS |
49.40 |
43.36 |
-6.04 |
| 5 |
Warner, Christopher C (8)
|
FGPCS |
|
45.48 |
- |
| 6 |
Mantilla, Thiago (10)
|
FGMS |
57.56 |
45.53 |
-12.03 |
| 7 |
Carey, Connor I (10)
|
FGSFTL |
50.80 |
46.38 |
-4.42 |
| 8 |
Rosenthal, Frederick B (10)
|
FGPCS |
45.11 |
47.06 |
1.95 |
| 9 |
Olive, Emerson L (7)
|
FGPCS |
48.25 |
47.63 |
-0.62 |
| 10 |
Dantas, Dylan (9)
|
FGBRST |
|
47.64 |
- |
| 11 |
Corrales, Renato (10)
|
FGSFTL |
53.98 |
47.98 |
-6.00 |
| 12 |
Linares, Lucas (9)
|
FGSFTL |
53.30 |
49.01 |
-4.29 |
| 13 |
Bass, Alistair J (8)
|
FGSFTL |
49.79 |
51.78 |
1.99 |
| 14 |
Cisternas-Acho, Maximiliano (10)
|
FGBRST |
|
52.03 |
- |
| 15 |
De Arcas, Pelayo (9)
|
FGMS |
|
57.38 |
- |
| 16 |
Antonio, Christian F (8)
|
FGPCS |
|
57.46 |
- |
|
Krasnov, Robert J (8)
|
FGPCS |
|
DQ |
- |
|
Paden, Joseph I (9)
|
FGPCS |
1:00.24 |
DQ |
- |
|
Bonini, Pietro (8)
|
FGMS |
|
DQ |
- |