';
| Fighter | Nickname | Height | Weight | Association | |
| Andrea Togni | 5'8" (1.73 m) |
145 lbs (65.77 kg) |
Underdog | ||
| Anthony Browder | "Underdog" | 5'6" (1.68 m) |
155 lbs (70.31 kg) |
Underdog MMA | |
| Anthony Offiaeli | "The Alpha" | 5'8" (1.73 m) |
170 lbs (77.11 kg) |
Underdog Mixed Martial Arts | |
| Anuj Anuj | 5'6" (1.68 m) |
170 lbs (77.11 kg) |
Underdog | ||
| Ben McCourt | 0'0" (0 m) |
185 lbs (83.91 kg) |
Team Underdog MMA | ||
| Carlos Candelario | "The Cannon" | 5'7" (1.7 m) |
129 lbs (58.51 kg) |
Underdog Brazilian Jiu-Jitsu | |
| David Michael Durao | "The Spider Monkey" | 0'0" (0 m) |
125 lbs (56.7 kg) |
Underdog Mixed Martial Arts | |
| Emmanuel Isuekpe | "The Rain" | 5'8" (1.73 m) |
155 lbs (70.31 kg) |
UGB MMA/ UNDERDOG FIGHT TEAM | |
| Este Lara | 0'0" (0 m) |
125 lbs (56.7 kg) |
Underdog Brazilian Jiu-Jitsu | ||
| Ilyar Askhanov | "Dynamite" | 5'9" (1.75 m) |
159 lbs (72.12 kg) |
Underdog Pro / Gepard | |
| Jason Irizarry | 0'0" (0 m) |
130 lbs (58.97 kg) |
Underdog Mixed Martial Arts | ||
| Jessy Miele | "The Widowmaker" | 5'7" (1.7 m) |
145 lbs (65.77 kg) |
Underdog MMA/IMBCT | |
| Johnny Lopez | "Mr. Nice Guy" | 5'6" (1.68 m) |
125 lbs (56.7 kg) |
Underdog Brazilian Jiu-Jitsu | |
| Josh Kaplan | "The Arian Barbarian" | 0'0" (0 m) |
160 lbs (72.57 kg) |
Underdog Brazilian Jiu-Jitsu | |
| Josh Flores | 5'8" (1.73 m) |
135 lbs (61.23 kg) |
Underdog Brazilian Jiu-Jitsu | ||
| Justin Valentin | 0'0" (0 m) |
125 lbs (56.7 kg) |
Underdog Brazilian Jiu-Jitsu | ||
| Khusniddin Khakimov | 6'0" (1.83 m) |
265 lbs (120.2 kg) |
Uzbekistan MMA / Underdog Uzbekistan | ||
| Marc-Andre Legault | 0'0" (0 m) |
155 lbs (70.31 kg) |
Underdog Gym | ||
| Matt Bessette | "The Mangler" | 5'10" (1.78 m) |
145 lbs (65.77 kg) |
Underdog Brazilian Jiu-Jitsu | |
| Maximus Fernandez | 0'0" (0 m) |
135 lbs (61.23 kg) |
Underdog Mixed Martial Arts | ||