| SQ | IESA - 8th Boys | 49.24 |
| Lane | Team | Squad | Athlete 1 | Athlete 2 | Athlete 3 | Athlete 4 | Seed | Note |
|---|---|---|---|---|---|---|---|---|
| 2 | Jack London | A | Plazola | Greenspan | Clark | Saucedo | 57.50 | |
| 3 | Aptakisic | A | Hannon | Jean-Simon | Palikot | Gawor | 56.84 | |
| 4 | Wilmette | A | Pearson | Yu | Jamnadas | Daniels | 56.84 |
| Lane | Team | Squad | Athlete 1 | Athlete 2 | Athlete 3 | Athlete 4 | Seed | Note |
|---|---|---|---|---|---|---|---|---|
| 2 | South (Arlington Heights) | A | O'Mara | Davis | Rosen | Kuehl | 54.90 | |
| 3 | Twin Groves | A | Lin | Puma | Williams | Lim | 52.67 | |
| 4 | MacArthur | A | Kim | Pavlov | Popov | Franczyk | 52.70 | |
| 5 | Haven | A | Simpson | Lydon | Gustafson | Gomberg | 56.25 |
| Lane | Team | Squad | Athlete 1 | Athlete 2 | Athlete 3 | Athlete 4 | Seed | Note |
|---|---|---|---|---|---|---|---|---|
| 1 | Thomas | A | Schwab | Oldenburg | Trawczynski | Ortman | 51.90 | |
| 2 | Lincoln (Mt. Prospect) | A | Ko | Russo | Fujiwara | Pasika | 50.40 | |
| 3 | Winston | A | Gaspard | Lopez | Zych | Gaspard | 47.69 | |
| 4 | Chute | A | Boyd | Harvey | Pryor | Preister | 49.81 | |
| 5 | Holmes | A | Rocha-Alvarez | Carreno | Campos | Bustos | 51.50 | |
| 6 | Long Grove Woodlawn | A | Sirota | Holmes | Becker | McCasey | 51.93 |