| Lane | Athlete | Team | Seed |
|---|---|---|---|
| 2 | WALLACE, Emma | Belvidere | 1:24.44 |
| 3 | MONROE, Mia | Bartlett | 1:14.78 |
| 4 | NAVA, Isabella | J. Sterling Morton Township | 1:09.56 |
| 5 | SCHULZ, Rebecca | Conant | 1:09.71 |
| 6 | MCDONALD, Samantha | Riverside (R.-Brookfield) | 1:16.03 |
| 7 | IRIZARRY, Cristal | Chicago (Taft) | NT |
| Lane | Athlete | Team | Seed |
|---|---|---|---|
| 1 | PIOTROWSKI, Melanie | Buffalo Grove | 1:08.40 |
| 2 | STALF, Ellen | Joliet (West) | 1:07.92 |
| 3 | HOOVER, Caitlyn | Minooka | 1:07.14 |
| 4 | BOGHOSSIAN, Araxi | Mt. Prospect (Prospect) | 1:06.20 |
| 5 | HAYS, Trinty | DeKalb | 1:07.00 |
| 6 | LARSEN, Mackenzie | Belvidere (North) | 1:07.35 |
| 7 | BABIN, Ashley | Roselle (Lake Park) | 1:08.14 |
| 8 | PALMER, Krystal | Hoffman Estates | 1:08.76 |