The US Open has signed an exclusive agreement with Kalshi, making it the tournament’s official prediction market platform partner. The deal bars other prediction market platforms from advertising at tournament venues or on television broadcasts, including ESPN channels carrying the event. Specific financial terms were not disclosed. The agreement was finalized after the qualifying rounds ended last week, despite the United States Tennis Association previously planning to explore prediction market partnerships starting in 2027 and beyond. New USTA CEO Craig Tiley, who joined in February after leading Tennis Australia for more than a decade, played a key role in securing the partnership for this year’s tournament.