| Lane | Team | Squad | Athlete 1 | Athlete 2 | Athlete 3 | Athlete 4 | Seed |
|---|---|---|---|---|---|---|---|
| 3 | Palos Hills (Stagg) | A | Gonzales | Para | Komperda | Swatowski | 1:42.50 |
| 4 | Orland Park (Sandburg) | A | Graham | Pounds | Moore | McDowell | 1:36.02 |
| 5 | New Lenox (Lincoln-Way Centr | A | Sons | Marin | Jelley | Luoma | 1:38.96 |
| Lane | Team | Squad | Athlete 1 | Athlete 2 | Athlete 3 | Athlete 4 | Seed |
|---|---|---|---|---|---|---|---|
| 1 | Lockport (Twp.) | A | Adeniyi | McGee | McGee | Clark | 1:35.80 |
| 2 | Frankfort (Lincoln-Way East) | A | Parker | Bohren | Usher | Robinson | 1:34.10 |
| 3 | New Lenox (Lincoln-Way West) | A | Markowicz | Wolf | Kennedy | Maka | 1:33.70 |
| 4 | Bradley (B.-Bourbonnais) | A | Jones | Allison | Teague | Armstrong | 1:32.27 |
| 5 | Bolingbrook | A | Wallace | Sawyer | Johnson II | Lampkins | DNS |
| 6 | Flossmoor (Homewood-F.) | A | Allen | Jones | Watkins | Blissett | 1:33.72 |
| 7 | Tinley Park (Andrew) | A | Lampkin-Smith | Massad | Danca | Maniatis | 1:35.00 |