Polymarket Withdraws Patrick Mahomes Week 1 Return Market Following CFTC Guidance

Polymarket US canceled a self-certified market regarding Patrick Mahomes' availability for the Kansas City Chiefs' regular-season opener against the Denver Broncos.

Polymarket US withdrew a self-certified trading market on Wednesday regarding whether Patrick Mahomes will participate in the Kansas City Chiefs' Week 1 regular-season game. The filing, originally submitted on Tuesday, was retracted less than 24 hours later following guidance from the Commodity Futures Trading Commission (CFTC). Mahomes is currently returning from a season-ending left knee injury sustained last year. While Polymarket removed the contract, the prediction market Kalshi continues to offer trading on Mahomes serving as the starter for the opener against the Denver Broncos as of Friday, August 28, 2026.

CFTC Intervention and Regulatory Compliance

A source from Polymarket informed ESPN on Friday that the CFTC requested multiple prediction market operators to remove contracts tied to individual player availability, specifically citing the Mahomes Week 1 market. The company stated the withdrawal was necessary to remain in full compliance with federal regulators. The CFTC has reportedly held similar discussions with at least one other prominent operator in the industry regarding NFL player status trades. Despite these discussions, Kalshi has not responded to inquiries about regulatory directions and maintains several markets focused on the return timelines of injured athletes.

NFL Objections to Injury-Related Markets

The NFL has formally communicated its opposition to the CFTC, stating that markets tied to injuries or officiating should be prohibited. League officials argue that these offerings are susceptible to manipulation by a single individual or could be influenced by information known in advance. Jeff Miller, the NFL’s executive vice president of public affairs, addressed the issue Wednesday at the NFL owners meeting in Atlanta, expressing hope that the CFTC would establish a formal process to vet the viability of such markets before they are posted publicly. The league specifically categorized the Mahomes return contract as an injury-related market.

Legal Battles and League Partnerships

While the NFL opposes prediction markets, it recently announced new commercial partnerships with three sportsbooks: DraftKings, FanDuel, and Fanatics. An NFL executive confirmed on Wednesday that the league is not considering any commercial relationship with the prediction market industry at this time. The sector faces ongoing legal challenges, including a recent ruling by a federal appeals court in San Francisco. That court ruled in favor of Nevada and its state gaming control board, denying a request by Kalshi to offer sports or political trading without a specific gambling license. Prediction markets remain under scrutiny over whether their contracts function as financial swaps or illegal gambling.

Integrity and Competition Concerns

Jeff Miller emphasized that the NFL’s primary goal is to protect the integrity of the competition. He noted that without a formal regulatory relationship with prediction markets, the league can only request that certain trades be barred. The NFL seeks an efficient system where it can consult on the legality and safety of specific betting products if they are eventually legalized. Currently, the league maintains that any market easily influenced by a single participant poses a risk to the sport's competitive standards. The CFTC has not yet issued a public response to requests for comment regarding its recent communications with these trading platforms.