Ailín Pérez Faces Macy Chiasson in High-Stakes Bantamweight Clash at UFC Mexico
MEXICO CITY, February 28, 2026 – Argentinian standout Ailín “Fiona” Pérez returns to the Octagon tonight at Arena CDMX, putting her five-fight winning streak on the line against Macy Chiasson. The bantamweight bout serves as a featured attraction of the UFC Fight Night: Moreno vs. Kavanagh preliminary card, with both fighters looking to solidify their standing in a wide-open division.
Fight Week Developments
Pérez (12-2) entered the week with her trademark confidence, making headlines for her “scathing” comments regarding the bantamweight division’s top names. During the official weigh-ins on Friday, February 27, Pérez successfully tipped the scales at 136 pounds, matching the weight of her opponent, Macy Chiasson. The buildup to the fight was marked by tension following an ultimatum reportedly issued by Pérez regarding the matchup’s weight requirements.
Analysts view this bout as a classic “Wrestling Grit vs. Lengthy Striking” confrontation. Pérez, known for her aggressive grappling and celebratory post-fight dancing, is coming off a significant victory over Karol Rosa in January 2025. A win tonight in Mexico City would extend her streak to six and likely propel her into the divisional top 10.
The Road to Arena CDMX
Since her promotional debut in September 2022, Pérez has transitioned from the featherweight division to become a force at bantamweight. Training out of “The Goat Shed,” she has utilized a high-pressure wrestling style to overwhelm opponents. Public insights suggest that her ability to scramble and work in the clinch will be the deciding factor against the reach advantage held by Chiasson.
Key Facts
| Full Name | Ailín Luciana Pérez |
|---|---|
| Nickname | Fiona |
| Date of Birth | October 05, 1994 |
| Place of Birth | Zárate, Buenos Aires, Argentina |
| Height | 5′ 5″ (165 cm) |
| Weight | 135 lb (61 kg) |
| Reach | 66.0″ |
| Leg Reach | 36.0″ |
| Pro MMA Record | 12-2-0 |
| Team | The Goat Shed |
Frequently Asked Questions
What is Ailín Pérez’s current winning streak?
As of February 28, 2026, Ailín Pérez is on a five-fight winning streak, with her most recent victory occurring against Karol Rosa in early 2025.
Where is Ailín Pérez fighting tonight?
She is competing at Arena CDMX in Mexico City, Mexico, as part of the UFC Fight Night: Moreno vs. Kavanagh event.
What was Ailín Pérez’s weight for the UFC Mexico bout?
Pérez officially weighed in at 136 pounds on February 27, 2026, the maximum limit for a non-title bantamweight contest.
When did Ailín Pérez make her UFC debut?
Pérez made her Octagon debut on September 3, 2022, in a bout against Zarah Fairn.