Combattants Etats-Unis
| 2001 |  | Roger Zapata | 0-1-0 UFC | #6133 |  |
| 2002 |  | Roland Dunlap | 1-0-0 REC | #6928 | |
| 2003 |  | Roland Payne | 0-1-0 UFC | #4344 | |
| 2004 |  | Roland Pruden | 1-1-0 REC | #2688 | |
| 2005 |  | Roli Delgado | 1-2-0 UFC | #4300 | |
| 2006 |  | Roman Faraldo | 2-2-0 REC | #3597 | |
| 2007 |  | Roman Puga | 2-0-0 REC | #362 | |
| 2008 |  | Roman Salazar | 0-2-0, 1NC UFC | #3359 | |
| 2009 |  | Romero Cotton | 1-2-0 REC | #4824 | |
| 2010 |  | Ron Faircloth | #7106 | | |
| 2011 |  | Ron Humphrey | 1-0-0 REC | #1554 | |
| 2012 |  | Ron Stallings | 1-2-0 UFC | #3553 | |
| 2013 |  | Ron Van Clief | 0-1-0 UFC | #4430 | |
| 2014 |  | Ron Waterman | 2-1-1 UFC | #3279 | |
| 2015 |  | Ronald Jhun | 0-1-0 UFC | #6632 | |
| 2016 |  | Ronda Rousey | 6-2-0 UFC | #211 | |
| 2017 |  | Ronnie Gibbs | 1-0-0 REC | #2144 | |
| 2018 |  | Ronnie Lawrence | 2-1-0, 1NC UFC | #3220 | |
| 2019 |  | Ronny Hauser | 0-1-0 REC | #6734 | |
| 2020 |  | Roosevelt Roberts | 4-5-0, 1NC UFC | #1696 | |
| 2021 |  | Rory Light | 1-0-0 REC | #6997 | |
| 2022 |  | Rory Markham | 1-2-0 UFC | #3571 | |
| 2023 |  | Rory Singer | 2-2-0 UFC | #3690 | |
| 2024 |  | Rose Namajunas | 12-7-0 UFC | #63 | |
| 2025 |  | Roxanne Modafferi | 4-8-0 UFC | #1913 | |