Bacillo Mefi Monterroso
UFC DebutNickname“Lil Monsta”
Record
Streak
L3
Age
Date of birth
- Fighting out of
- San Jose, California
- Born
- United States
- Weight class
- Flyweight
- Height
- 5'1" · 155 cm
Before the UFC
Bacillo Mefi Monterroso makes their UFC debut
Our striking, grappling, and schedule metrics are measured from UFC fights, so they come online after this bout. Here is the career they bring in — and how live the opposition has been.
Pre-UFC opposition
StrongOpponents' combined record
61-36
.629 win rate
Winning-record opponents
6 of 9
carried winning pro records
Pro bouts faced
12
9 opponents with records on file
A descriptive read of the non-UFC slate from opponents’ full career pro records — not a UFC-grade Schedule Score.
UFC fight history
No UFC bouts on record yet.
Outside the UFC
across 12 bouts · 11 promotions · wins by 2 KO · 1 sub · 3 decLFA · Anthony Pettis FC 17 · PRFC 1 · Action Fight League · Combate Global +6
| Res | Opponent | Outcome | Finish | Rd | Time | Promotion | Date |
|---|---|---|---|---|---|---|---|
| L | Sergio Plascencia | Decision | Unanimous | R3 | 5:00 | Anthony Pettis FC 17 | Jun 15, 2025 |
| L | Jonathan Sepulveda10-7 | Decision | Unanimous | R3 | 5:00 | PRFC 1 | Jun 17, 2023 |
| L | Christian Ynastrilla14-5 | Submission | Rear-Naked Choke | R1 | 1:33 | Action Fight League | Jan 20, 2023 |
| W | KO/TKO | Punches | R2 | 4:13 | LFA | Jul 29, 2022 | |
| L | Edgar Chairez13-6 | KO/TKO | Body Kick and Punches | R2 | 0:10 | Combate Global | Apr 9, 2021 |
| L | KO/TKO | Knee to the Body and Punches | R1 | 0:30 | LFA | Oct 2, 2020 | |
| W | Dan Cormier | Decision | Unanimous | R3 | 5:00 | Cage Titans FC | Apr 14, 2018 |
| W | Kyle Gothan0-1 | Submission | Keylock | R1 | 3:24 | KOTC | Mar 18, 2017 |
| L | Submission | Triangle Choke | R2 | 2:45 | URCC 29 | Jan 7, 2017 | |
| W | KO/TKO | Punch | R1 | 0:15 | WFC 18 | Nov 5, 2016 | |
| W | Nico Lozada4-4 | Decision | Split | R3 | 5:00 | WFC 17 | May 7, 2016 |
| W | Fabian Parra | Decision | Unanimous | R3 | 5:00 | Crank It Up Promotions | Sep 12, 2015 |
Non-UFC bouts (regional/other promotions) — shown for context only, excluded from Schedule Score, striking/grappling rates, and every UFC-scoped metric.
Amateur
5-1across 6 amateur bouts · 5 promotions559 Fights · WCS 20 · WCS 18 · Elite Combat Sports · Rocktagon MMA
| Res | Opponent | Outcome | Finish | Rd | Time | Promotion | Date |
|---|---|---|---|---|---|---|---|
| W | Freddy Mendez0-1 | Submission | — | R3 | 1:28 | WCS 20 | Jun 27, 2015 |
| W | Randall Schuckman9-10 | Decision | Split | R3 | 3:00 | WCS 18 | Jan 23, 2015 |
| W | Ricardo Sanchez2-5 | Decision | Split | R3 | 3:00 | 559 Fights | Oct 5, 2014 |
| L | Carlos Hernandez1-3 | Decision | Unanimous | R3 | 2:00 | 559 Fights | Aug 29, 2014 |
| W | Toby Fuentes | Decision | Split | R3 | 2:00 | Elite Combat Sports | May 5, 2012 |
| W | Michael Gall | Decision | Unanimous | R3 | 2:00 | Rocktagon MMA | Feb 19, 2012 |
Amateur (pre-professional) bouts — shown for context only and excluded from the professional record and every UFC-scoped metric.