Mazda Iowa 100
Iowa Speedway
.894 Mile Paved Oval
100 Laps/89.4 Miles
July 8, 2018
| Finish | Start | Driver | Car # | Sponsor/Name | Chassis | Engine | Laps | Status | Points |
| 1 | 1 | Patricio O'Ward | 27 | Riverina CDMX Mexico City | Dallara IL-15 | Mazda MZR-R | 100 | 0:34:37.2551 154.935 | 47 |
| 2 | 2 | Colton Herta | 98 | Deltro Energy | Dallara IL-15 | Mazda MZR-R | 100 | 0:34:40.0809 124.725 | 38 |
| 3 | 5 | Santiago Urrutia | 5 | BSE | Dallara IL-15 | Mazda MZR-R | 100 | 0:34:42.9371 154.513 | 33 |
| 4 | 3 | Ryan Norman | 48 | Journey | Dallara IL-15 | Mazda MZR-R | 100 | 0:34:43.2954 154.486 | 29 |
| 5 | 4 | Dalton Kellett | 28 | K-Line Insulators USA | Dallara IL-15 | Mazda MZR-R | 100 | 0:34:45.1907 154.346 | 26 |
| 6 | 7 | Victor Franzoni | 23 | Mazda | Dallara IL-15 | Mazda MZR-R | 100 | 0:34:45.8309 154.298 | 23 |
| 7 | 6 | Aaron Telitz | 9 | Rice Lake Weighing Systems | Dallara IL-15 | Mazda MZR-R | 100 | 0:34:46.8152 154.225 | 21 |