Key Insights
- The sports strategy of Kalshi gains further power by having exclusive access, as prediction markets vie for bigger leagues and tournaments.
- Rushed rollout raises questions, as there were still disclaimers on public materials that there was no affiliation with the US Open.
- Regulatory uncertainty remains significant because federal and state courts have issued conflicting decisions over sports contracts.
Kalshi secured an exclusive agreement with the U.S. Tennis Association to become the US Open’s prediction market partner. The deal gives the company exclusive promotional rights while courts continue debating whether sports event contracts constitute gambling.
The agreement took effect immediately after qualifying rounds ended last week. Financial terms remain undisclosed, and the USTA had initially considered waiting until 2027 before entering the sector.
Last-minute deal changes tournament plans
The USTA held discussions with prediction market companies in recent weeks. Match integrity and future commercial partnerships reportedly formed part of those talks.
That timetable changed after Craig Tiley became USTA chief executive on July 20. Sources familiar with the agreement credited Tiley with helping secure a partnership for the 2026 tournament.
The agreement reportedly prevents competing prediction market companies from advertising at the US Open venue. It also covers television exposure, including ESPN broadcasts. However, the partnership arrived without a fully coordinated public rollout. The US Open’s official partner list did not include Kalshi when the main draw began.
A company blog post also carried an earlier disclaimer saying it had no US Open or WTA affiliation. That disclosure appeared alongside analysis of the women’s singles tournament. The mismatch suggests the agreement moved faster than the organizations’ public communications.
Sports markets become a growth engine
The partnership expands an increasingly aggressive push into professional sports. Kalshi already holds an NHL partnership alongside Polymarket and recently expanded its MLB presence.
The company announced partnerships with five MLB teams on August 25. Those teams include the Atlanta Braves, Boston Red Sox, Los Angeles Dodgers, San Diego Padres and San Francisco Giants.
Kalshi said baseball trading volume had increased 36-fold from the previous year. Its US Open markets also attracted significant activity as the tournament began.
By early Monday, traders had placed roughly $1.6 million into the women’s singles winner market. The broader sector has grown rapidly as well. Combined August trading volume across Kalshi, Polymarket and Polymarket US reached about $41.2 billion.
Kalshi accounted for approximately $33.7 billion of that total. The figures show why major sports properties have become increasingly valuable to prediction market operators.
Developments that stand out from the latest agreement.
- Exclusive advertising rights could give Kalshi greater visibility among sports audiences.
- Other platforms have less chance to advertise alternative contracts in the tournament.
- The agreement could encourage other major sporting bodies to consider similar arrangements.
Legal pressure grows alongside expansion
The commercial expansion comes as regulators and courts challenge sports prediction contracts. The Ninth U.S. Circuit Court of Appeals dealt the company a setback in Nevada on August 28.
The court found that Kalshi had not shown that federal commodities law would likely preempt Nevada gambling regulations. The ruling allowed Nevada to continue pursuing its case involving sports event contracts. That decision contrasts with an earlier Third Circuit ruling involving New Jersey. That court granted preliminary protection against state enforcement while Kalshi pursued its federal preemption arguments.
New York has also taken a tougher position. A federal judge rejected Kalshi’s request for an injunction in July, allowing the state’s gambling claims to continue. Meanwhile, Baltimore sued Kalshi and Polymarket on August 13. The city alleges that their sports contracts function as unlicensed betting products.
The competing rulings create uncertainty for prediction market operators. Yet sports organizations continue signing commercial agreements with the industry.
What the US open deal signals
The USTA agreement gives prediction markets another foothold within mainstream American sports. It also demonstrates how quickly the sector can move from regulatory controversy into major commercial relationships.
The deal could influence how other leagues assess prediction markets. If operators can create significant trading during live sporting events, then exclusive sponsorships may be more appealing.
Meanwhile, undecided and unresolved jurisdictional issues may make those partnerships complex. Meanwhile, state officials say sports betting is the same as traditional betting and bet predictor websites feel they’re eligible for federal rules.
That’s why the US Open design is more than just a promotional tool. It’s putting a pivotal tennis occasion right next to a business with a basic lawful issue in its back yard.
Conclusion
The deal with the US Open is another sign of the game’s swift adoption into professional sports. The agreement puts Kalshi in a stronger position and will limit the ability of other platforms to advertise tournaments.
But the commercial tide is still up in the air, however, given the legal backdrop. The state’s gambling authority and federal oversight remain uncertain in the wake of conflicting court decisions.
The US Open deal is a big clue to investors and sports executives. Regulatory resistance is nothing to stop prediction markets from taking a major step toward the mainstream of sports.
