Sorted alphabetically by last name · 2769 fighters
| Name | Nickname | |
|---|---|---|
| RW | Rob Wilkinson | "Razor" |
| RY | Rob Yundt | "Monster" |
| RL | Robbie Lawler | "Ruthless" |
| RD | Robelis Despaigne | "The Big Boy" |
| RB | Robert Bryczek | |
| RD | Robert Drysdale | |
| RL | Robert Lucarelli | |
| RM |
| "Bubba" |
| RP | Robert Peralta | "Problems" |
| RR | Robert Ruchala |