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'He couldn't even walk': an infection wipes out the UFC Vegas 124 main event and leaves Bonfim without a fight nine days out

Sean Brady's knee swelled after a bike workout and within hours he couldn't walk. Brazil's Gabriel Bonfim, chasing a sixth straight win, is left without an opponent and the UFC improvises a heavyweight headliner.

By Equipo La Jaula Props · October 31, 2026 · 1 min read

Photos: Weighing In, CC BY 3.0 · Sexto Round, CC BY 3.0 (via Wikimedia Commons, cropped)

UFC Vegas 124, scheduled for Saturday, November 7 at the Meta APEX in Las Vegas, has lost its main event. Sean Brady, No. 5 at welterweight, has pulled out of his five-round fight against Brazil's Gabriel Bonfim, No. 6, with barely nine days' notice.

What happened to Brady

Brady explained it himself on a YouTube channel: on Tuesday night, after a bike workout, his knee swelled, and by 9 p.m. he couldn't walk. "I knew this wasn't bursitis; I knew it was an infection," he said. The diagnosis: a staph infection. With his mobility so limited, fighting in just over a week wasn't an option.

Bonfim, baffled

Bonfim, who was looking to extend a five-fight win streak in his third straight main event, confirmed on Instagram that his fight was cancelled. He said Brady told them a week before the fight and admitted he found it hard to understand. Still, he stayed upbeat: "I believe there will be news coming soon and we keep going. The goal is just one: to be champion."

The new main event

According to reporter Laerte Viana, the event will be headlined by a heavyweight fight between Dominican Waldo Cortes-Acosta and Brazil's Johnny Walker. The UFC hasn't officially confirmed it yet.

Cortes-Acosta, No. 8 at heavyweight and a 2022 Contender Series winner, is coming off two straight losses: to Alexander Volkov at UFC 328 and to Curtis Blaydes in September.
Walker, who moved up from light heavyweight, debuted at heavyweight at UFC 332 by knocking out Mick Parkin with a knee.

November 7 start times

U.S. Eastern: prelims 5 p.m. · main card 8 p.m.
U.S. Pacific: 2 p.m. · 5 p.m.
United Kingdom: 10 p.m. · 1 a.m. (Sunday).

The La Jaula take

The big loser isn't Brady: it's Bonfim

Brady heals and comes back; his ranking doesn't move. Bonfim loses much more: he came in on a five-fight win streak with the chance to beat a top-5 opponent in a main event, exactly what gets you closer to a title shot. Now he's without a fight at the worst possible time, with welterweight more chaotic than ever because of the Prates vs. Morales interim title.

The smart move for the UFC would be not to leave him idle: rebook the Brady fight as soon as he's healthy or give him another top-10 opponent in December. Every month without fighting is a month others pass him in line.

The new main event is a lifeline with little at stake: Cortes-Acosta is coming off two losses and Walker just moved up. A fun knockout fight, but it doesn't change heavyweight.

Our verdict:Walker by knockout in the main event. And Bonfim back before the end of the year if the UFC finds him an opponent.

Frequently asked questions

Why isn't Sean Brady fighting at UFC Vegas 124?

Because of a staph infection in his knee. It swelled after a bike workout and within hours he couldn't walk.

Who was Brady supposed to fight?

Brazil's Gabriel Bonfim, in the UFC Vegas 124 main event on November 7, 2026 in Las Vegas.

Will Bonfim get a new opponent?

Not on this card. Bonfim himself confirmed his fight was cancelled and said he expects news soon.

What is the new UFC Vegas 124 main event?

According to reporter Laerte Viana, Waldo Cortes-Acosta vs. Johnny Walker at heavyweight. The UFC hasn't officially confirmed it yet.

What time is UFC Vegas 124?

Saturday, November 7: main card at 8 p.m. ET (5 p.m. PT), prelims at 5 p.m. ET.

Sources