Anthony Joshua has turned to the power of Polymarket to back up his prediction of a knockout win against Jake Paul in Miami on Friday evening.
The two-time unified heavyweight champion will throw hands against YouTuber-turned-boxer Paul at the 20,000-capacity Kaseya Centre.
The professional bout dubbed ‘Judgment Day’ will be streamed live on Netflix.
Fight fans don’t appear so keen to attend in person with thousands of tickets left unsold ahead of the heavyweight clash.
Paul, 28, has generally fought at cruiserweight, although he did step up a division to beat a then 58-year-old Mike Tyson in November last year.
Joshua, 36, issued a chilling threat to Paul, saying he will win by knockout in the opening rounds.
He has used prediction markets heavyweight Polymarket to back up his claim on social media.
Anthony Joshua And Polymarket
On Monday, Joshua posted a screen grab of a Polymarket prediction market on X.
It showed he was being backed at 73% to win by a knockout, technical knockout or a disqualification.
100% loading… 🔥 pic.twitter.com/TQDxHFuQbd
— Anthony Joshua (@anthonyjoshua) December 16, 2025
There was no indication that it was a sponsored tweet as his caption read simply: “100% loading.”
It wasn’t the first time the British Boxer had utilised Polymarket as a visual aid though.
On December 10 Joshua tagged Polymarket’s official account in a tweet that included a custom-made graphic.
It showed the Watford Warrior in front of a Polymarket graph and included the hashtags #poweredbypolymarket and #ad.
.@PolymarketSport x AJ 📈
Markets don’t lie. App loading 📲 #poweredbypolymarket #ad pic.twitter.com/8AfYwWSR9e
— Anthony Joshua (@anthonyjoshua) December 10, 2025
The graphic also contained ‘ROUND 4’ which we can take as Joshua’s prediction of when he will floor Paul.
Fight night will begin at 1am UK time on Saturday with the main event scheduled for eight three-minute rounds.
There has been no official word that Joshua has any promotional deal in place with Polymarket.
Who Are Polymarket?
Polymarket are a leading player in prediction markets, an increasingly popular format in the US where users can predict the specific outcome of an event by backing a yes or no answer.
Shayne Coplan founded the company in 2020 and after operating offshore the company recently received federal approval to relaunch in the US.
In October it received perhaps the strongest endorsement possible with a $2 billion investment from Intercontinental Exchange, the owner of the New York Stock Exchange.
That reflected a company value approaching $8 billion pre-investment.
Polymarket has also agreed a multi-year deal with TKO Group Holdings.
The financial exchange has become the Official and Exclusive Prediction Market Partner of UFC and Zuffa Boxing.
Coplan, 27, envisages a future where people can use Polymarket to accurately assess popular feeling around current events.
That could ultimately aid decision making when it comes to something like a local election.
Prediction Markets Versus The Sports Betting Industry
The sports betting industry has actively opposed the emergence of sports prediction markets.
Financial exchanges such as Kalshi and Polymarket have to seek federal legislation which allows them to operate throughout the US.
Sportsbooks have to apply to each individual state regulator to operate in their region and are subject to local tax revenue laws.
Early prediction markets focussed on events such as the US presidential election and the Oscars.
Kalshi’s move into full-time sports prediction markets at the turn of the year sparked the backlash from the betting industry.
It has seen state regulators attempting to curb the activities of financial exchanges in their regions through the courts.
That view has changed in recent months, with DraftKings, FanDuel, and Fanatics all leaving the American Gaming Association.
All three now have plans to get on board with the prediction markets boom.
