| # | Driver | Team | Championships | Career wins | FIA Category | Racer Rating |
|---|---|---|---|---|---|---|
| 1 | Tonis Kasemets | Wulver Racing | 1 | 8 | Silver | 4,201 |
| 2 | Bruce Hamilton | Wulver Racing | 0 | 2 | Bronze | 3,810 |
| 3 | Anthony Lazzaro | Sean Creech Motorsport | 0 | 2 | Bronze | 3,717 |
| 4 | Nigel Greensall | Sean Creech Motorsport | 0 | 1 | Bronze | 3,690 |
| 5 | Lance Willsey | Sean Creech Motorsport | 0 | 8 | Bronze | 3,599 |
| 6 | Terry Olson | Jr III Racing | 1 | 5 | Bronze | 3,407 |
| 7 | Niclas Jönsson | D MOTORSPORTS | 0 | 2 | Silver | 3,374 |
| 8 | Michael Watt | D MOTORSPORTS | 0 | 2 | Bronze | 3,359 |
| 9 | Francesco Melandri | Sean Creech Motorsport | 0 | 3 | Bronze | 3,075 |
| 10 | Danny Kok | Conquest Racing | 1 | 0 | Bronze | 2,864 |
| 11 | Indy Al Miller | One Motorsports | 0 | 0 | Bronze | 2,771 |
| 12 | George Staikos | Conquest Racing | 1 | 0 | Bronze | 2,611 |
| 13 | Robert Iversen | One Motorsports | 0 | 1 | Bronze | 2,110 |
The IMSA Prototype Challenge was a single-seat prototype series that raced LMP3 sportscars in support of the WeatherTech SportsCar Championship. The series ran multiple classes of identical or near-identical machinery and fielded a professional field with a substantial amateur contingent; Bronze-graded drivers outnumbered Silvers, and Golds were sparse. Drivers like George Kurtz and Nolan Siegel established themselves here before moving to the top IMSA ranks. The series sat between IMSA Mazda Prototype Lites and the full WeatherTech grid on the professional pyramid, serving as a critical step upward for young talent from club racing and lower-level series. Most drivers arrived from Mazda Prototype Lites or Pilot Challenge and moved on to WeatherTech or international endurance racing; some stepped sideways to GT4 America instead. The series is no longer active.