| Lane | Team | Squad | Athlete 1 | Athlete 2 | Athlete 3 | Athlete 4 | Seed | 
|---|---|---|---|---|---|---|---|
| 2 | Palos Hills (Stagg) | A | Russo | Tsoutsas | Szczech | Kramer | 53.19 | 
| 3 | Naperville (North) | A | Robinson | Desai | Fleury | Longenbaugh | 52.91 | 
| 4 | Palos Heights (Shepard) | A | Ayres | Flowers | Folk | McIlvaine | 52.58 | 
| 5 | Orland Park (Sandburg) | A | Landers | Calderon | Driscoll | Jackson | 52.83 | 
| 6 | Lockport (Twp.) | A | Alfaro | Kofira | Bafia | Bickute | 52.97 | 
| 7 | Lemont (H.S.) | A | Herold | Bechtlofft | Nelson | Reyes | 55.34 | 
| Lane | Team | Squad | Athlete 1 | Athlete 2 | Athlete 3 | Athlete 4 | Seed | 
|---|---|---|---|---|---|---|---|
| 1 | Lisle (Benet Academy) | A | Kelly | Grimes | Fernandez | Kuceba | 52.28 | 
| 2 | Aurora (Metea Valley) | A | Williams | Foxhall | Beardsley | Harris | 51.54 | 
| 3 | Wheaton (W. Warrenville Sout | A | Huelskoetter | Wach | Cooper | Macabobby | 49.98 | 
| 4 | Naperville (Central) | A | Comer | McCracken | Orth | Wood | 49.70 | 
| 5 | Aurora (Waubonsie Valley) | A | Pavuk | Garcia | Ahmadian | Wright | 49.84 | 
| 6 | Naperville (Neuqua Valley) | A | Ukawuba | Tymen | Aremu | Tymen | 50.69 | 
| 7 | Romeoville (H.S.) | A | Maglaya | Miller | Meschino | Harvey | 51.82 | 
| 8 | Bolingbrook | A | Johnson | Wideman | Cephas | Jackson | 52.47 |