Ailin Perez’s Ultimatum Met as Macy Chiasson Makes Weight for UFC Mexico City

ailin perez warned she would refuse to fight if Macy Chiasson missed weight, and that showdown for the women’s bantamweight division has taken a new turn: Macy Chiasson successfully made weight for UFC Mexico City, resolving the immediate scale drama ahead of the bout scheduled for Saturday, Feb. 28, 2026, at Arena CDMX in Mexico. The development matters because Perez had publicly threatened to pull out of the prelims clash if Chiasson hit the scales over limit.

Ailin Perez’s ultimatum and the weigh-in storyline

No. 7-ranked women’s bantamweight Ailin Perez drew headlines when she stated she would not accept a fight if Macy Chiasson missed weight. Perez stressed she had prepared for three months to both make weight and to compete, and said she sees Chiasson every day at the UFC Performance Institute (UFC PI) and believes Chiasson looks "very big. " Perez emphasized a strict stance on weight, noting prior occasions when Chiasson failed to make the division limit.

Weigh-in history and the immediate outcome

Macy Chiasson, the Season 28 winner of The Ultimate Fighter, has a documented history with the scale: she has officially missed weight twice in the UFC and required catchweight bouts on two other occasions. Chiasson also previously offered a catchweight with Ketlen Vieira when she was not going to make the limit. That history prompted Perez’s public ultimatum, and the latest update is that Chiasson successfully made weight for this fight.

Prelims placement and event context

The Chiasson vs. Perez matchup is scheduled for the prelims of UFC Mexico City on Feb. 28 at Arena CDMX. The event’s main narrative includes a headliner listed as Brandon Moreno vs. Lone’er Kavanagh, with the Chiasson–Perez clash slated earlier on the card. With the weigh-in concerns addressed, UFC officials will nonetheless keep a close eye on final procedures to ensure the bout proceeds as planned.

Fighting styles, records and the matchup dynamics

• Macy Chiasson (10-5) enters the fight coming off back-to-back defeats, dropping decisions to Yana Santos and Ketlen Vieira; those losses raised questions about her immediate standing in the division and suggested she could be fighting for her UFC future.
• Ailin Perez (12-2) arrives on a run of five straight UFC wins, building momentum through grinding takedowns, heavy top control and relentless clinch pressure. Perez’s recent sequence includes a clinch-heavy win over Karol Rosa, an overwhelming performance against Darya Zheleznyakova, and a win over Joselyne Edwards.

Stylistically, Chiasson’s advantages include size—she is listed at 5-foot-11—length, a long jab and teep arsenal, and an ability to muscled opponents to the fence, threaten front chokes and take backs in clinch scenarios. Notable finishes in her recent past include a stoppage of Mayra Bueno Silva and a submission of Pannie Kianzad, evidence of finishing upside when dominant.

Where Perez has the clearer path is by turning the fight into a grinding wrestling battle: she chains takedowns from the clinch, uses body-locks and inside trips, and is expert at mat returns and heavy top control. If Perez can neutralize Chiasson’s range, force extended grappling scrambles, and sustain pressure—especially at Mexico City altitude—she can bank control time and pile up points and damage from top position.

Key variables and what to watch on fight night

• Weight management: Chiasson’s successful weigh-in removes the immediate cancellation risk, but her past misses and the scrutiny leading up to the bout keep attention on official procedures.
• Clinches and takedown entries: If Perez consistently gets under Chiasson’s reach and drags the fight into wrestling exchanges, momentum favors Perez.
• Range control and defensive wrestling: If Chiasson can maintain mid-range, defend early takedowns, and exploit her length and striking, she can blunt Perez’s pressure and seek a decision or a finish.
• Conditioning at altitude: Mexico City’s conditions could affect gas tanks; the fighter who manages pacing and recovery may gain a late-round edge.

With weigh-in drama addressed and both fighters now confirmed for the prelims, attention shifts to fight strategy and execution on Feb. 28 at Arena CDMX. The matchup pairs a surging Argentine wrestler with a physically imposing, experienced striker, setting up a stylistic clash that could decide who climbs the women’s bantamweight ladder—and whether Perez’s ultimatum proved decisive or simply a headline on the road to fight night.