| Lane | Athlete | Yr. | Team | Seed | Note |
|---|---|---|---|---|---|
| 3 | Borghans, Roberto | JR | Chicago (Latin) | NT | |
| 4 | Ciszewski, Michael | FR | Norridge (Ridgewood) | 1:05.00 | |
| 5 | Posada, Edmond | FR | Westmont | 1:09.80 | |
| 7 | Michaels, Christian | SO | Chicago (Francis W. Parker) | NT | |
| 8 | Satpathy, Atman | JR | Chicago (Latin) | NT |
| Lane | Athlete | Yr. | Team | Seed | Note |
|---|---|---|---|---|---|
| 1 | Ryan, Ian | JR | Westmont | 1:01.10 | |
| 2 | Nunez, Billy | SO | Elmwood Park | 58.90 | |
| 3 | Jones-Plasencia, Mike | SO | Elmwood Park | 58.20 | |
| 4 | Powell, Jair | SR | Aurora (Illinois Math and Science Academy) | 52.16 | |
| 6 | Hernandez, Roman | FR | Norridge (Ridgewood) | 58.80 | |
| 7 | Humphrey, Ryan | FR | Chicago (Francis W. Parker) | 59.24 | |
| 8 | Lamadrid, Osmar | FR | North Chicago | 1:03.00 |