Kalshi is now the Official Prediction Market Partner of the US Open, the USTA announced Monday, bringing the predictions platform into one of tennis's biggest global stages just as the 2026 tournament gets underway.
Kalshi-US Open Deal Details
The multi-year agreement kicks off with the 2026 US Open Singles Main Draw, giving Kalshi a footprint across US Open digital platforms and on-court signage throughout the event. It's the latest sign of how quickly prediction markets have moved from a niche corner of finance into mainstream sports properties, following a wave of similar tie-ins across other leagues over the past year.
An Integrity Framework Built In
Unlike a typical sponsorship rollout, this deal comes bundled with a formal integrity structure. The USTA and Kalshi have agreed to restrict markets tied to subjective, in-match calls, things like umpire rulings and code violations, that could otherwise create incentive problems. Kalshi has also struck a confidential data-sharing arrangement with the International Tennis Integrity Agency (ITIA) for real-time market surveillance during the tournament.
That combination of proactive monitoring, stakeholder education, and strict enforcement mirrors the kind of compliance framework major sports leagues have leaned on as legal sports betting expanded, and it signals that prediction market operators are being held to a similar standard as they move into officially licensed territory.
Why It Matters for Prediction Market Bettors
The US Open partnership is a notable step up in visibility for Kalshi, which has spent the past year building out contracts across sports, finance, and pop culture. For fans looking to get involved, tennis markets let traders take positions on match winners, set outcomes, and tournament futures in real time, a different structure than traditional fixed-odds betting but one that's resonated with a growing user base.
