Racing & Rally Winners Database
Racing & Rally Winners Database
| Round | Circuit | Date | Winner | Vehicle * | Entrant |
|---|---|---|---|---|---|
| 1 |  Barber | 2021.04.17 | Dallara IL-15 - Mazda | HMD Motorsports | |
| 2 | 2021.04.18 | Dallara IL-15 - Mazda | HMD Motorsports | ||
| 3 | St. Petersburg | 2021.04.24 | Dallara IL-15 - Mazda | Andretti Autosport | |
| 4 | 2021.04.25 | Dallara IL-15 - Mazda | HMD Motorsports | ||
| 5 | Indianapolis | 2021.05.14 | Dallara IL-15 - Mazda | HMD Motorsports | |
| 6 | 2021.05.15 | Dallara IL-15 - Mazda | HMD Motorsports | ||
| 7 | Belle Isle Park | 2021.06.12 | Dallara IL-15 - Mazda | Andretti Autosport | |
| 8 | 2021.06.13 | Dallara IL-15 - Mazda | Andretti Autosport | ||
| 9 | Road America | 2021.06.19 | Dallara IL-15 - Mazda | Andretti Autosport | |
| 10 | 2021.06.20 | Dallara IL-15 - Mazda | HMD Motorsports | ||
| 11 | Mid-Ohio Sports Car Course | 2021.07.03 | Dallara IL-15 - Mazda | Andretti Autosport | |
| 12 | 2021.07.04 | Dallara IL-15 - Mazda | Andretti Autosport | ||
| - |  Toronto | 2021.07.10 | Race cancelled (COVID-19 pandemic) | ||
| - | 2021.07.11 | Race cancelled (COVID-19 pandemic) | |||
| 13 | Gateway | 2021.08.20 | Dallara IL-15 - Mazda | HMD Motorsports | |
| 14 | 2021.08.21 | Dallara IL-15 - Mazda | HMD Motorsports | ||
| 15 | Portland | 2021.09.11 | Dallara IL-15 - Mazda | HMD Motorsports | |
| 16 | 2021.09.12 | Dallara IL-15 - Mazda | Andretti Autosport | ||
| 17 | Laguna Seca | 2021.09.18 | Dallara IL-15 - Mazda | Andretti Autosport | |
| 18 | 2021.09.19 | Dallara IL-15 - Mazda | Andretti Autosport | ||
| 19 | Mid-Ohio Sports Car Course | 2021.10.02 | Dallara IL-15 - Mazda | Andretti Autosport | |
| 20 | 2021.10.03 | Dallara IL-15 - Mazda | HMD Motorsports | ||
