Sorted alphabetically by last name · 2707 fighters
| Name | Nickname | |
|---|---|---|
| SH | Seo Hee Ham | |
| SK | Seokhyeon Ko | "The Korean Tyson" |
| SP | Sergei Pavlovich | |
| SK | Sergey Khandozhko | "Honda" |
| SM | Sergey Morozov | |
| SS | Serghei Spivac | "Polar Bear" |
| SM | Sergio Moraes | "The Panther" |
| SP | Sergio Pettis | |
| SS | Serhiy Sidey | |
| SB | Seth Baczynski | "The Polish Pistola" |