Kalshi News: Exclusive US Open Deal Meets a Fresh Legal Challenge

Kalshi News: What the Nevada Ruling Means for Sports Contracts

Today's Kalshi news centers on a last-minute exclusivity deal: Kalshi has become the official prediction market partner of the US Open, in an agreement that reportedly blocks rival platforms from advertising anywhere near the tournament — including across ESPN's broadcast coverage. The partnership lands the same week Kalshi absorbed a legal setback in one of its ongoing state-regulator disputes.

Source: X (formerly Twitter)

What the US Open Deal Actually Covers

Per reporting citing two sources familiar with the agreement, the deal between Kalshi and the U.S. Tennis Association (USTA) includes:

• Effective immediately, timed to the start of the tournament's main draw at Flushing Meadows

• Finalized only after qualifying rounds concluded last week — a genuinely last-minute agreement

• No disclosed financial terms

• An exclusivity clause barring rival prediction market platforms from advertising both at the physical venue and across ESPN's television coverage of the tournament — an unusual scope for this kind of sponsorship

The USTA hadn't originally planned to bring on a prediction market partner this year at all — that had been under consideration for 2027 and beyond. New USTA CEO Craig Tiley, who joined the organization in February 2026 after 21 years running Tennis Australia and officially took over as CEO on July 20, is credited with pushing the deal through in time for this year's tournament instead.

An Unusually Quiet Rollout

For an "exclusive" sponsorship, the rollout has been notably understated. As of Sunday afternoon, when the main draw began:

• The Chicago-based platform did not appear on the US Open's official partner list

• Neither Kalshi, the USTA, nor ESPN had issued a public announcement confirming the deal

• Kalshi had, earlier the same day, published its own blog post analyzing the women's singles field — with Aryna Sabalenka listed as the betting favorite at 23% — that included a disclaimer stating the platform is "not affiliated with the U.S. Open or WTA"

• The prediction-market operator declined to comment when asked directly about the deal; the USTA and ESPN did not immediately respond either

That gap between a reportedly signed exclusivity agreement and Kalshi's own public disclaimer denying affiliation is worth sitting with — it suggests the deal was struck quickly enough that the company's own compliance and marketing language hadn't yet caught up to the new arrangement.

Part of a Bigger Sports Push

The US Open deal is the latest in a rapid string of sports partnerships for the prediction market. Recent additions include:

Kalshi has said baseball-related trading volume on its platform has risen roughly 36-fold year over year. More broadly, sports-related contracts continue to drive the bulk of activity across the prediction market sector: Kalshi, Polymarket, and Polymarket US generated a combined $41.2 billion in trading volume in August alone, with Kalshi accounting for $33.7 billion of that total. Competing platforms are moving just as aggressively — Polymarket holds deals with MLB and the New York Yankees, while newer entrant Novig recently became the first prediction market to partner directly with an individual MLB team, the New York Mets.

Kalshi News: The Legal Backdrop Doesn't Go Away

This expansion continues even as Kalshi's underlying legal position remains contested. On the same week as the US Open deal, the Ninth Circuit Court of Appeals ruled against the company in its dispute with Nevada, finding the company hadn't sufficiently shown that federal commodities law preempts Nevada's state gambling regulations over sports-event contracts.

That ruling directly conflicts with an earlier Third Circuit decision that blocked New Jersey from regulating Kalshi's sports contracts — deepening a genuine legal split over whether state gaming regulators or the federal Commodity Futures Trading Commission (CFTC) has jurisdiction over this category of contract. That unresolved conflict is the central legal question hanging over every new sports partnership the platform signs, including today's US Open deal.

Conclusion

Today's Kalshi news shows a company expanding aggressively into premier sports properties — from MLB teams to the NHL to now an exclusive US Open deal with real advertising restrictions on competitors — while simultaneously losing ground in at least one of the state-level legal fights that could determine whether contracts like these remain legal nationwide. The unusually quiet, undisclosed rollout of the US Open deal, paired with Kalshi's own same-day disclaimer denying affiliation, suggests the agreement moved faster than either side's public communications did.

Disclaimer

This article is for informational purposes only and does not constitute financial or betting advice. Details regarding the US Open partnership are based on reporting citing sources familiar with the deal; neither Kalshi nor the USTA had publicly confirmed the agreement as of this writing. Trading volume and legal case details are drawn from publicly available data and court rulings, current as of August 31, 2026. Prediction market contracts carry financial risk and remain subject to an unresolved legal dispute over state versus federal jurisdiction. Always verify current details through official Kalshi, USTA, and court channels before making decisions based on this information.