Polymarket bet grows $500 to $252K after UFC call error

At UFC 327 in Miami on Saturday, announcer Bruce Buffer initially declared Chris Padilla the winner of the Padilla‑Mederos bout. After a commercial break, a commentator said the fight had been scored a majority draw and the announced outcome was corrected. Polymarket’s platform had moved Padilla’s probability near certainty before the correction, then re‑priced the market to roughly even odds for each fighter.

A Polymarket user with the handle JESUSCHRISTISGOOD placed a $500 wager on MarQuel Mederos while the platform showed him with about a 0.1% chance. After the market adjusted, that position was worth more than $252,000. The user’s Polymarket profile shows an account registration in January and describes the payout as their largest on the site.

The trader posted on X that they had reviewed the bout’s official scorecard and, after calculating the judges’ totals, found points had been recorded in error for Padilla. That check occurred before the public correction and allowed the user to place the bet while Mederos’s market odds were extremely low. Other users who bought shares on Padilla before the correction saw the value of those positions decline when the market reset.

Polymarket’s platform reflected the initial broadcast announcement by shifting probabilities, which enabled several users to trade at prices that assumed Padilla had won. When the announced result changed, real‑time pricing reversed those positions.

The incident was the second mistaken fight announcement in about two weeks that affected bettors’ positions. Broadcasters’ statements during live events can move prediction markets quickly as new information is reported.

Polymarket and other platforms have been updating systems to detect suspicious trading patterns after several rapid market swings. Polymarket has pursued partnerships with sports leagues; the company reached an agreement with Major League Baseball last month and with the UFC in November. Polymarket CEO Shayne Coplan commented, “By bringing prediction markets to the broadcast and arena, we’re giving fans a new way to be part of the action, not just watching outcomes but watching the world’s expectations evolve with every round.”

Regulatory pressure on prediction markets has increased. The Department of Justice and the Commodity Futures Trading Commission jointly filed lawsuits against Illinois, Arizona and Connecticut, arguing the CFTC has exclusive jurisdiction to regulate sports‑related wagers on platforms such as Polymarket. Lawmakers and critics have raised concerns about insider trading and market manipulation and called for clearer rules and tighter oversight.

Polymarket said it is refining measures to identify suspicious transactions and to protect market integrity. The company and its competitors remain under scrutiny as prediction markets interact with live sports broadcasts and rapid information flows on television and social media.