The USTA and Kalshi today announced a partnership that makes Kalshi the Official Prediction Market Partner of the US Open. The multi-year agreement begins with the 2026 US Open Singles Main Draw, which starts today. Kalshi will have a presence throughout the 2026 US Open across US Open digital platforms and on-court signage.
"We're relentless about keeping tennis at the cutting edge of global sports innovation and fan connection," said USTA CEO Craig Tiley. "Partnering with Kalshi gives us an opportunity to pioneer that next generation of fan engagement while ensuring the integrity of our sport."
The partnership comes amid the rapid growth of prediction markets across tennis and professional sports. Kalshi has millions of users, and tennis-related trading volume on the platform is up 25x YoY.
"Every summer the US Open takes over New York, and as a New York company, we're proud to be part of it. Tennis is one of the fastest-growing sports on Kalshi, with fans using our markets to understand what's happening throughout the tournament," said Kalshi co-founder and CEO Tarek Mansour. "We're proud to partner with the USTA to give fans even more ways to engage with the game they love.”
Together, the USTA and Kalshi have established a comprehensive integrity framework for the US Open, designed to protect competitive fairness in an evolving market landscape. Under the agreement, markets that present an integrity risk—such as umpire decisions and code violations—will be restricted. Kalshi has also executed a confidential data-sharing agreement with the International Tennis Integrity Agency (ITIA) for real-time market surveillance, complementing the USTA's multi-layered strategy of proactive monitoring, stakeholder education and strict compliance enforcement.
