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- Kalshi secured an exclusive US Open partnership, blocking competitor prediction market advertising across tournament venues and broadcasts.
- The agreement lands amid mounting legal challenges, including a Ninth Circuit ruling favoring state-level gambling regulation.
Kalshi has secured an exclusive partnership with the U.S. Tennis Association to become the US Open’s prediction market platform partner, with the agreement taking effect as the tournament’s main draw began in New York.
The deal is notable because it gives one of the highest-profile U.S. sports events a formal tie-up with a prediction market operator at a time when Kalshi is expanding in sports while still fighting state-by-state legal challenges over its event contracts. Financial terms were not disclosed.
According to the reported terms, the agreement prevents rival prediction market companies from advertising at the US Open venue and across tournament television coverage, including ESPN broadcasts. Front Office Sports also reported that the partnership was finalized after the qualifying rounds and followed discussions involving multiple prediction market platforms and match-integrity concerns.
Kalshi already offers contracts tied to US Open matches, including individual men’s and women’s singles contests. Some of those tennis contracts have recorded more than $1 million in trading volume.
As of Sunday afternoon, Kalshi was not listed on the US Open’s official partner page. A Kalshi blog post about the women’s singles tournament also still included language saying the company was “not affiliated with the U.S. Open or WTA.”
Deal adds a major sports-stage partner for Kalshi
The US Open is owned and operated by the USTA. Front Office Sports reported that Craig Tiley, who became USTA CEO on July 20, played a major role in pushing for the 2026 agreement.
The exact duration and broader scope of the partnership were not disclosed. But the immediate effect of the deal appears to be exclusivity around prediction market advertising tied to the tournament.
The partnership also lands as prediction market platforms push further into sports-related event contracts and seek mainstream visibility through major leagues and events.
Legal fights continue as Kalshi expands sports contracts
Kalshi’s sports push is still unfolding against a mixed legal backdrop.
On Aug. 28, the Ninth U.S. Circuit Court of Appeals ruled that Kalshi had not shown the Commodity Exchange Act was likely to preempt Nevada gaming regulations as applied to its sports event contracts. The court said the sports event contracts at issue did not qualify as swaps because they were sports bets.
That case stemmed from a cease-and-desist letter from the Nevada Gaming Control Board, which alleged Kalshi was operating a sports betting platform in violation of state law and gaming regulations. The Ninth Circuit also remanded issues involving Kalshi’s election contracts to the district court.
Elsewhere, the Third Circuit previously upheld preliminary relief blocking New Jersey regulators from enforcing state gambling laws against Kalshi’s sports contracts. In July, a federal judge in New York rejected Kalshi’s injunction bid there. And on Aug. 13, Baltimore sued Kalshi and Polymarket over alleged unlicensed sports betting, also naming Coinbase, Robinhood, and Webull because they distribute Kalshi contracts to customers.
What comes next for the US Open partnership is less clear. The financial terms remain undisclosed, and it is still unknown how the tournament will reflect the agreement across official partner listings and other event marketing.
Source: As reported by news.google.com.
