Mairon Santos (20-2, 10) was born in Rio de Janeiro, Rio de Janeiro, Brazil on June 10, 2000. At the age of 18 years on March 16, 2019, he made his professional MMA debut against Phelipe Silva, winning the fight via 1st-round TKO.
On August 24, 2024, 24-year old Mairon Santos made his UFC debut on his 19th professional MMA fight at UFC Fight Night against Kaan Ofli, winning the fight in the 2nd round via TKO.
Santos' last fight was a 3rd-round TKO win against Muhammad Naimov at UFC 323: Dvalishvili vs. Yan 2 at age 25 on December 6, 2025. He is on a 8-fight winning streak.
He has fought four times in the UFC, and has a record of 4 wins and 0 losses in the promotion.
Some of Mairon Santos' best fights have been against Muhammad Naimov, Francis Marshall, Kaan Ofli, Sodiq Yusuff, Julio Pereira and Guillermo Torres. For details about these fights refer to "Best fights of Mairon Santos".
Santos has 2 losses on his MMA record. For details about these losses refer to "Mairon Santos Losses".
| # | Date | Opponent | Promotion | Weight | Round | Method | Result |
|---|---|---|---|---|---|---|---|
22  | Dec 6, 2025 25 years, 5 months 20-2 (10) | 31 years, 3 months 13-3 (7) | UFC | LT | 3 | TKO | Win Jab-cross Combo |
21  | May 17, 2025 24 years, 11 months 19-2 (9) | 31 years, 11 months 13-4 (7) | UFC | LT | 3 | UD | Win |
20 | Mar 8, 2025 24 years, 8 months 18-2 (9) | Francis Marshall | UFC | FT | 3 | SD | Win |
19 | Aug 24, 2024 24 years, 2 months 17-2 (9) | Kaan Ofli | UFC | FT | 2 | TKO | Win Left Hook to Ground Strikes |
18 | Apr 9, 2024 23 years, 9 months 16-2 (8) | Guillermo Torres | TUF | FT | 3 | UD | Win |
17 | Mar 27, 2024 23 years, 9 months 15-2 (8) | Edwin Cooper Jr. | TUF | FT | 3 | SD | Win |
16 | Mar 24, 2023 22 years, 9 months 14-2 (8) | Rafael Barbosa | FT | 3 | UD | Win | |
15 | May 28, 2022 21 years, 11 months 13-2 (8) | Jason Wong | LT | 2 | SUB | Win Rear Naked Choke | |
14 | Feb 4, 2022 21 years, 7 months 12-2 (7) | Dan Argueta | BT | 3 | TKO | Loss Ground & Pound | |
13 | Jul 18, 2021 21 years, 1 months 12-1 (7) | Tiago Ramos | LT | 1 | UD | Loss | |
12 | Feb 20, 2021 20 years, 8 months 12-0 (7) | Paulo Roberto Aquiles | LT | 2 | TKO | Win Punches | |
11 | Nov 8, 2020 20 years, 4 months 11-0 (6) | André Borges | LT | 3 | SD | Win | |
10 | Mar 1, 2020 19 years, 8 months 10-0 (6) | Julio Pereira | FT | 3 | TKO | Win Punch to the Body | |
9 | Dec 14, 2019 19 years, 6 months 9-0 (5) | Baba Boundjou Nadjombe | LT | 3 | UD | Win | |
8 | Oct 12, 2019 19 years, 4 months 8-0 (5) | Robert Wilson | FT | 3 | UD | Win | |
7 | Sep 28, 2019 19 years, 3 months 7-0 (5) | Willian Telles | CR | 1 | TKO | Win Punches | |
6 | Aug 17, 2019 19 years, 2 months 6-0 (4) | Paulo Ricardo Rodrigues | LT | 3 | TKO | Win Punches | |
5 | Jun 29, 2019 19 years 5-0 (3) | Vinicius Morinischi | LT | 1 | TKO | Win Punches | |
4 | Jun 8, 2019 18 years, 11 months 4-0 (2) | Nicolas Sávio | BT | 3 | UD | Win | |
3 | Apr 5, 2019 18 years, 9 months 3-0 (2) | Micael Braga | WL | 3 | UD | Win | |
2 | Mar 24, 2019 18 years, 9 months 2-0 (2) | Alan Ferreira | FL | 1 | TKO | Win Retirement | |
1 | Mar 16, 2019 18 years, 9 months 1-0 (1) | Phelipe Silva | FL | 1 | TKO | Win Retirement |
