Regulated prediction market platform Kalshi became the official and exclusive prediction market partner of the US Open tennis tournament, effective August 30, 2026. The deal with the USTA includes an exclusivity clause that bars rival prediction market platforms from advertising at tournament venues and on ESPN broadcast channels. USTA CEO Craig Tiley finalized the partnership just weeks after his appointment in July 2026, despite originally planning to explore sponsorship opportunities starting in 2027. The women’s singles winner market recorded approximately $1.5 million in trading volume in the early hours of the tournament. This alliance marks Kalshi’s first Grand Slam tennis partnership, following existing deals with multiple Major League Baseball clubs.
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