Biography
Ronaldo Junior is a Brazilian jiu-jitsu black belt and standout representative of Atos Jiu-Jitsu, known for his explosive athleticism, relentless pace, and powerful no-gi game. An IBJJF No-Gi Worlds Champion, he has competed on major professional stages including UFC BJJ, WNO, and CJI 2.
Ronaldo’s style is built around sharp wrestling entries, strong positional control, and a dangerous front headlock system. His high-elbow guillotine, anaconda, darce and snap-down sequences are among his most effective weapons, making him a constant submission threat in scrambles and standing exchanges.
Combining elite athleticism with a dynamic, forward-pressure approach, Ronaldo Junior remains one of the most exciting and well-rounded competitors to come out of the Atos camp. In late 2025, he became the inaugural UFC BJJ Middleweight Championship after a spectacular performance against William Tackett.
Personal
* Legend status is reserved for retired athletes with outstanding achievements and a lasting impact on the sport.
Rankings
| Opponent | Result | Date | Event | Method | Weight | Round | Points |
|---|---|---|---|---|---|---|---|
| Tarik Hopstock | Win | 2/12/2026 | UFC BJJ 5 | Unanimous Decision | Middleweight | Championship | 800 |
| William Tackett | Win | 12/11/2025 | UFC BJJ 4 | Unanimous Decision | Middleweight | Championship | 1060 |
| Giancarlo Bodoni | Loss | 8/31/2025 | CJI 2 | Armbar | Quintet | Semi-Finals | — |
| Charles Negromonte | Draw | 8/31/2025 | CJI 2 | N/A | Quintet | Quarter-Finals | 80 |
| Felipe Costa | Win | 3/6/2025 | UFC FPI 10 | Points: 2-0 | 185LBS | — | 300 |
| Jacob Rodriguez | Win | 2/7/2025 | WNO 26 | Decision | Middleweight | — | 357 |
| Nick Mataya | Win | 12/5/2024 | UFC FPI 9 | Anaconda | 180LBS | — | 291 |
| Isaque Bahiense | Win | 10/10/2024 | UFC FPI 8 | Anaconda | N/A | — | 364 |
| Kody Steele | Win | 3/3/2024 | UFC FPI 6 | Decision | 77KG | — | 291 |
| David Garmo | Win | 2023 | No-Gi Worlds | Decision | 85KG | Finals | 274 |
| Sebastian Rodriguez | Win | 2023 | No-Gi Worlds | Advantage | 85KG | Semi-Finals | 180 |
| Gabriel Castro | Win | 2023 | No-Gi Worlds | Decision | 85KG | Quarter-Finals | 72 |
| Austin Oranday | Win | 2023 | No-Gi Worlds | Advantage | 85KG | 16 | 54 |
| Antonio Zuazo | Win | 2021 | Boise No-Gi | Points: 16-0 | Absolute | Finals | 1 |
| Joshua Bacallao | Win | 2021 | Boise No-Gi | Points: 12-2 | Absolute | Semi-Finals | 1 |
| Craig Jones | Loss | 2021 | WNO 6 | Inside heel hook | 88KG | — | — |
| Paulo Gabriel | Win | 2020 | No-Gi Pans | Points: 2-0 | 79KG | Semi-Finals | 54 |
| Stephen Simms | Win | 2020 | No-Gi Pans | Advantage | 79KG | Quarter-Finals | 18 |
| Jeferson Guaresi | Win | 2020 | No-Gi Pans | Points: 4-2 | 79KG | 16 | 12 |
| Chad Hardy | Win | 2020 | No-Gi Pans | Points: 5-0 | 79KG | 32 | 9 |
| Vagner Rocha | Loss | 2020 | WNO | Decision | 86KG | — | — |
| Marcos Martins | Loss | 2019 | No-Gi Worlds | Points | 85KG | — | — |
| Kyle Chambers | Loss | 2019 | Subversiv 2 | EBI Overtime | 83KG | — | — |