Sorted alphabetically by last name · 2769 fighters
| Name | Nickname | |
|---|---|---|
| RS | Robert Sanchez | "Littlefury" |
| RV | Robert Valentin | "Robzilla" |
| RW | Robert Whiteford | "The Hammer" |
| RW | Robert Whittaker | "The Reaper" |
| RR | Roberto Romero | "El Charro Negro" |
| RS | Roberto Soldic | "Robocop" |
| RT | Roberto Traven | "Spider" |
| RL |
| Rocky Lee |
| RW | Rodney Wallace | "Shonuff the Master" |
| RB | Rodolfo Bellato | "Trator" |