| Lane | Athlete | Yr. | Team | Seed | Note |
|---|---|---|---|---|---|
| 1 | ALLEN, Eric | JR | Parkway Central High School | 1:28.00 | Unverified: |
| 2 | KENNEDY, Jak | SO | Rockwood Summit High School | 1:05.66 | Verified |
| 3 | BROWN, Brandon | 9 | Ladue Horton Watkins High School | 1:05.00 | Unverified: |
| 4 | UELSMANN, Grant | SO | Rockwood Summit High School | 59.10 | Verified |
| 5 | WILLIAMS, Wilbert | 9 | McCluer High School | 1:02.06 | Verified |
| 6 | VERA, Esteban | SR | Parkway Central High School | 1:05.20 | Verified |
| 7 | CADE, Tyler | SO | McCluer High School | 1:07.53 | Verified |
| 8 | CARTER, Brendan | SO | McCluer High School | NT | Unverified: |
| Lane | Athlete | Yr. | Team | Seed | Note |
|---|---|---|---|---|---|
| 1 | THOMPSON, Brian | SO | McCluer North High School | 56.58 | Verified |
| 2 | STRAUSS, Jules | 9 | Parkway West High School | 56.44 | Verified |
| 3 | BROWN, Stanley | 9 | Parkway Central High School | 54.92 | Verified |
| 4 | LEVINE, Owen | SO | Ladue Horton Watkins High School | 53.94 | Verified |
| 5 | VIA, Gavin | SO | Ladue Horton Watkins High School | 53.95 | Unverified: |
| 6 | RIMMER, Keshawn | SO | McCluer North High School | 55.51 | Verified |
| 7 | CAREVIC, Jordan | SO | Parkway West High School | 56.48 | Verified |
| 8 | DAVIS, Ja'Mes | SO | McCluer North High School | 56.78 | Verified |
