Kalshi becomes exclusive prediction market partner for US Open

Kalshi just secured the kind of partnership that most prediction market platforms would trade their entire order book for. The regulated prediction market has become the official, and exclusive, prediction market partner of the US Open tennis tournament, effective as of August 30, 2026, when the main draw commenced. The deal with the United States Tennis Association includes an exclusivity clause that bars rival prediction market platforms from advertising at tournament venues and through ESPN’s broadcast channels. How the deal came together The partnership’s speed is notable given the timeline. Craig Tiley took over as USTA CEO on July 20, 2026, and originally planned to explore sponsorship opportunities starting in 2027. Instead, the deal was finalized before the main draw even started, just weeks after Tiley’s appointment. The financial terms of the agreement remain undisclosed. Neither Kalshi, the USTA, nor ESPN have issued public statements about the partnership, which only adds to the intrigue around a deal that insiders have described as “unusual” in its exclusivity provisions. By the early hours of the tournament, Kalshi’s women’s singles winner market had already recorded ...