| Lane | Athlete | Yr. | Team | Seed | Note | 
|---|---|---|---|---|---|
| 2 | MASOOD, Saed | SR | Glen Ellyn (Glenbard West) | 1:00.41 | |
| 3 | IRBY, Lucas | SR | Downers Grove (North) | 54.22 | |
| 4 | GOWEN, Matt | SR | Downers Grove (North) | 53.61 | |
| 5 | MCGOVERN, Matthew | JR | LaGrange (Lyons) | 53.98 | |
| 6 | REDMOND, Travonte | JR | Hillside (Proviso West) | 55.93 | |
| 7 | KNIGHT, Evan | JR | Glen Ellyn (Glenbard West) | NT | 
| Lane | Athlete | Yr. | Team | Seed | Note | 
|---|---|---|---|---|---|
| 1 | ANJARWALA, Mehlum | JR | Hinsdale (Central) | 52.59 | |
| 2 | MENDEZ, Alexander | SR | Hillside (Proviso West) | 52.24 | |
| 3 | REED, Derrick | SR | Oak Park (O.P.-River Forest) | 51.71 | |
| 4 | WATCKE, Daniel | JR | Hinsdale (Central) | 48.89 | |
| 5 | REMPFER, Jack | JR | LaGrange (Lyons) | 51.27 | |
| 6 | VALESKI, Joey | JR | Elmhurst (York) | 52.14 | |
| 7 | GLENNON, Leo | JR | Elmhurst (York) | 52.28 | |
| 8 | VALLE, Santiago | SO | Oak Park (O.P.-River Forest) | 52.94 |