Belgium's 4-1 defeat of the United States on Jul. 6 became the most wagered soccer match in American history, setting records at sportsbooks and prediction platforms Polymarket and Kalshi.
Key Points:
- BetMGM, FanDuel and Caesars each logged their busiest soccer match ever during the round of 16 clash.
- Contracts tied to a US tournament win drew $122 million on Polymarket and $64 million on Kalshi.
- Belgium's win handed sportsbooks one of their most profitable nights of the year.
BetMGM, FanDuel, Caesars Betting Records
BetMGM counted more betting tickets on the round of 16 game than on any soccer event in its history. The match also outdrew every 2026 NBA, NHL and NCAA Tournament playoff game, along with every College Football Playoff contest except the Indiana and Miami title decider. Senior trading manager Christian Cipollini said the tournament has delivered "record-type handle stuff for us this whole time."
FanDuel recorded its highest number of active bettors and its largest handle for any soccer match in company history, with more than twice the customers of any game staged before the tournament. Caesars confirmed a company record for unique soccer customers, beating a mark that England and Mexico had set only one day earlier in their own knockout meeting.
The night drew 42 million television viewers across two networks, more than any non-NFL broadcast this century, and paid off handsomely for the house.
Roughly 81% of the qualification money at Caesars backed the Americans to reach the quarterfinals. One Circa Sportsbook customer staked $750,000 on a US passage at -130 odds. Belgium's four-goal display turned those positions into one of BetMGM's biggest single-game wins of the year, in any sport.
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Polymarket, Kalshi Volume Surge
Prediction markets rode the same wave, as contracts tied to a US tournament victory drew $122 million on Polymarket and another $64 million on Kalshi ahead of kickoff. Both platforms priced an American title below 5% at the time, a sign that volume followed excitement around the match rather than realistic title hopes.
Kalshi has kept daily volume above $1 billion since the tournament opened on Jun. 11 and cleared more than $31 billion in June trading, a jump of over 70% from May. Polymarket posted a monthly record of $10.8 billion and dangled a $2 million prize for a perfect knockout bracket.
Solidus Labs chief executive Asaf Meir called the tournament a "pressure test" of whether young platforms can keep markets fair at this scale.
The soccer betting record had fallen repeatedly even before Monday night, with FanDuel reporting that each of the first two US group games broke its previous mark. The American win over Bosnia and Herzegovina then reset the bar at Caesars, before Argentina against Cape Verde and England against Mexico pushed the figure higher within days.
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