World Challenge 2018 Road America
- EL
- P1 GT/GTS
- P2 GT/GTS
- P3 GT/GTS
- P4 GT/GTS
- Q GT/GTA
- Q GTS/GTSA
- GRID1 GT/GTS
- RACE1 GT/GTS
- FL1 GT/GTS
- GRID2 GT/GTS
- RACE2 GT/GTS
- FL2 GT/GTS
| # | Piloto | Classe | Carro | Equipe | Sponsor | |
|---|---|---|---|---|---|---|
| 2 |  Daniel Morad | GT | Mercedes-AMG GT3 |  CRP Racing | DeVilbiss | |
| 3 |  Rodrigo Baptista | GT | Bentley Continental GT3 | K-Pax Racing | Opti-Coat | |
| 9 |  Alvaro Parente | GT | Bentley Continental GT3 | K-Pax Racing | Opti-Coat | |
| 24 |  Michael Christensen | GT | Porsche 911 GT3 R (991) | Alegra Motorsports | Insync Healthcare Solutions | |
| 31 |  Daniel Mancinelli | GT | Ferrari 488 GT3 | TR3 Racing | TR3 Racing, Oprena | |
| 45 | Lawrence DeGeorge | GT | Lamborghini Huracan GT3 | DXDT Racing | USALCO | |
| 61 |  Toni Vilander | GT | Ferrari 488 GT3 | R. Ferri Motorsport | Ferrari of Ontario, Toronto, Alberta, Zekelma | |
| 96 | Scott Hargrove | GT | Porsche 911 GT3 R (991) | Pfaff Motorsports | Pfaff Porsche, Castrol, Carbon Marine, Glasur | |
| 07 |  Martin Fuentes | GTA | Ferrari 488 GT3 | Squadra Corse Garage Italia | Garage Italia, Hublot, Alpha Prime, Italia In | |
| 19 | Parker Chase | GTA | Audi R8 LMS | TruSpeed Autosport | Vertical Bridge, Probalance Protein Water | |
| 46 | Andy Wilzoch | GTA | Porsche 911 GT3 R (991) | Flying Lizard Motorsports | ||
| 55 | Yuki Harata | GTA | Lamborghini Huracan GT3 | Dream Racing | Ace 1E | |
| 63 | David Askew | GTA | Mercedes-AMG GT3 | DXDT Racing | USALCO, Security National Mortgage | |
| 91 | Anthony Imperato | GTA | Porsche 911 GT3 R (991) | Wright Motorsports | Henry Repeating Arms | |
| 27 | Ryan Hardwick | GT Cup | Lamborghini Huracan Super Trofeo | Dream Racing | 1st Phorm, Dream Racing | |
| 1 | Lawson Aschenbach | GTS | Chevrolet Camaro GT4 | Blackdog Speed Shop | Blackdog Speed Shop | |
| 04 | George Kurtz | GTS | Audi R8 LMS GT4 | Global Motorsports Group | Crowdstrike, GMG Racing, Amazon Web Services | |
| 10 | Vinnie Allegretta | GTS | Ford Mustang GT4 | PF Racing | PF Racing | |
| 11 | Tony Gaples | GTS | Chevrolet Camaro GT4 | Blackdog Speed Shop | Blackdog Speed Shop | |
| 12 | Drew Staveley | GTS | Ginetta G55 | Ian Lacy Racing | G3 Racing, Ian Lacy Racing | |
| 13 | Orey Fidani | GTS | Porsche Cayman GT4 CS-MR | Pfaff Motorsports | Orlando Corporation, Pfaff Porsche, C17 Media | |
| 14 | James Sofronas | GTS | Audi R8 LMS GT4 | Global Motorsports Group | GMG Racing, Mobil 1, 5.11 Tactical, Thermal C | |
| 22 | Marko Radisic | GTS | BMW M4 GT4 | Precision Driving | Precision Driving | |
| 23 | Adam Merzon | GTS | Audi R8 LMS GT4 | Caseit Racing by Flying Lizard | Caseit Inc | |
| 40 | James Pesek | GTS | Ford Mustang GT4 | PF Racing | PF Racing | |
| 43 | Steve Burns | GTS | Ginetta G55 | Ian Lacy Racing | VP Racing Fuels, Ian Lacy Racing | |
| 50 | Ian James | GTS | Panoz Avezzano GT4 | DeltaWing Racing | ||
| 51 | Preston Calvert | GTS | Panoz Avezzano GT4 | DeltaWing Racing | Calvert Dynamics, Boy's Republic | |
| 62 | Mark Klenin | GTS | McLaren 570S GT4 | KPR | Premiere Copier | |
| 69 | Harry Gottsacker | GTS | SIN R1 | Racers Edge Motorsports | FRAM, Autolite, Protein Water, Gruene Harley | |
| 71 | Nicolai Elghanayan | GTS | KTM X-Bow GT4 | MarcoPolo Motorsports | Performance Racing Tech Talk | |
| 72 | Shane Lewis | GTS | Chevrolet Camaro GT4 | Robinson Racing | 74 Ranch Resort | |
| 74 | Gar Robinson | GTS | Chevrolet Camaro GT4 | Robinson Racing | 74 Ranch Resort | |
| 77 | Alan Brynjolfsson | GTS | Ford Mustang GT4 | VOLT Racing | Volt Lighting | |
| 83 | James Clay | GTS | BMW M4 GT4 | BimmerWorld | OPTIMA Batteries, Red Line Oil, Performance F | |
| 89 | Fred Roberts | GTS | Maserati Grand Turismo MC GT4 | JCR Motorsports | Enercare, Amana, Wolseley | |
| 99 | Jeff Courtney | GTS | Maserati Grand Turismo MC GT4 | JCR Motorsports | Kenda, X-ANALYTICS, RecStuff.com |