A fleeting error in the UFC cage turned into one of the most striking prediction-market trades of the weekend. A Polymarket user turned a $676 position into roughly $67,000 after Bruce Buffer briefly announced the wrong winner in the heavyweight bout between Marcin Tybura and Tyrell Fortune on March 29, 2026.
The mistake lasted only moments, but that was enough to send prices into extreme dislocation. As traders reacted to the initial announcement rather than the verified result, Tybura shares surged to 0.99 while Fortune shares collapsed to 0.01, opening a narrow but highly profitable arbitrage window.
Hit my first 100x on Polymarket!
$670 → $67,000
but here's the crazy part: I almost bought Tybura at 99¢ with $100k. stopped, realized something was off.
cancelled my order, scooped up 1c shares instead. the UFC corrected the winner seconds later. easiest 100x ever https://t.co/vBO9eEA3pU pic.twitter.com/OM2XWVXfzI
— Verrissimus (@verrissimus) March 29, 2026
A split-second pricing error created an outsized opportunity
The market moved almost instantly after Buffer incorrectly named Tybura as the winner. Because prediction platforms such as Polymarket price live probabilities in real time, the false announcement was absorbed by the order book within seconds, even though nothing about the actual fight result had changed.
That reaction produced a classic liquidity-driven whipsaw. Heavy buying in Tybura and a rush to dump Fortune pushed both contracts to their practical extremes, showing how quickly public misinformation, even when accidental, can overwhelm price discovery during live events.
The trader who capitalized on the moment did so by moving against the crowd. Using the handle LlamaEnjoyer, also known as Verrissimus on X, the trader reportedly scrapped a planned $100,000 purchase of Tybura at 99 cents after sensing something was wrong, then redirected just $676 into Fortune shares priced at 1 cent.
When the UFC corrected the announcement and Fortune was confirmed as the actual winner, the trade flipped from nearly worthless to fully priced. Those 1-cent shares returned to 1.00, turning a tiny contrarian wager into about $67,000 in proceeds in less than a minute.
The episode exposed the strengths and fragilities of live prediction markets
What happened was not simply a lucky trade, but a sharp demonstration of how live-event markets function under stress. Prediction markets reduce friction and surface information quickly, but that same speed means an erroneous public signal can distort prices before participants have time to verify the underlying reality.
Polymarket ultimately resolved the contract according to the official fight result, not the mistaken in-arena announcement. That distinction restored the market to the correct outcome, but only after the arbitrage window had already closed and the gains had been captured by the few traders fast enough to react.
When live-event markets are moving on a single headline or announcement, speed matters, but so does the ability to pause, question the signal and reverse course before liquidity disappears. For platforms, the episode is another reminder that governance and clear resolution standards matter most when public information briefly goes wrong.
