Kalshi signs exclusive, multi-year deal as official prediction market partner of US Open
Kalshi has signed a multi-year, exclusive deal to become the official prediction market partner of the US Open under an agreement with the United States Tennis Association. The partnership gives Kalshi sole rights to offer event contracts tied to the tournament, including on-court signage and digital integration. The Block reported that the deal bars rival platforms from advertising at the tournament and on its ESPN broadcasts. Terms were not disclosed. Kalshi is expanding its sports event contract offerings beyond politics and finance while fighting state regulators over whether its federally regulated contracts fall under state gambling laws.
The US Open exclusivity locks in tournament-level inventory that rivals cannot access for the contract's full term. Kalshi now controls the only federally regulated prediction market tied to a Grand Slam event, a marketing edge in user acquisition against DraftKings Predicts, Robinhood Derivatives, and Novig. The ESPN broadcast ban on rival advertising amplifies that advantage: competitors cannot match Kalshi's court-side visibility during the sport's largest US audience.
This mirrors Kalshi's MLB stadium strategy, where official partner status drives sign-ups in states that block sportsbooks. Each exclusive sports deal raises the stakes in Kalshi's state court fights. An attorney general injunction against Kalshi contracts in a key market would simultaneously void the marketing spend and the tournament exclusivity that justified it.
Kalshi's US Open exclusivity sharpens competition among regulated platforms racing to secure major sports inventory.