Kalshi traders are pricing Alexander Zverev as a 57% favorite over Ben Shelton in Sunday's US Open men's final. Shelton is bidding to end a 23-year American Grand Slam title drought.

Kalshi prices the Kansas City Chiefs at 56 cents to win their Week 1 matchup against the Denver Broncos. Both quarterbacks are projected in roughly half of DFS lineups: Patrick Mahomes at 52.2% and Bo Nix at 51.5%.

Kalshi's most traded NFL Week 1 market is Dallas Cowboys at New York Giants, scheduled for Sunday at 8:20 p.m. ET. The matchup tops the exchange's opening weekend board. Separately, Kalshi and Polymarket traders are pricing Buffalo Bills vs. Houston Texans as the tightest Week 1 game. Both platforms are listing player prop contracts alongside game outcomes. The Cowboys-Giants market leads the Week 1 slate in user activity on Kalshi.

Kalshi traders have pushed down the price on a JJ McCarthy trade market by 5% from where it stood less than a week ago. The market settles based on whether the Minnesota Vikings quarterback is still with the team as of December 1, 2026.

Kalshi traders are pricing Tennessee at 82% to win its Week 2 college football matchup against Georgia Tech, with the Yellow Jackets at 19%. Georgia Tech is coming off a stunning home upset loss to Colorado.

As the NFL season kicks off, celebrities including LeBron James, Sydney Sweeney, and Marshawn Lynch have begun endorsing prediction markets. The article frames this as part of a broader prediction market roundup tied to the NFL season launch.

Kalshi prediction-market traders are pricing Notre Dame at a 12% probability to win the college football national championship this season, according to a Facebook post citing the platform. The Irish hold the second-highest odds among teams tracked on the exchange.

KashRock has launched an esports consensus odds API that aggregates pricing from three prediction and betting platforms: Thunderpick, Kalshi, and Polymarket. The service covers Counter-Strike 2, League of Legends, Valorant, and Dota, converting each source's odds into a single de-vigged fair probability. Access to the API is gated.

Real App has partnered with FanDuel to bring sports betting and prediction markets to its platform. The deal was announced Thursday, September 11. The article body provides no further details on terms, scope, or timeline.

Kalshi has signed tennis great Pete Sampras as a celebrity athlete endorser, including a U.S. Open spot. The deal follows a separate multimillion-dollar agreement between the US Open and Kalshi that players oppose. The two partnerships give Kalshi both tournament-level branding and star power during the event. Sampras joins a growing roster of celebrity backers for prediction market platforms. Player opposition to the US Open deal remains unresolved.

H2 Gambling Capital projects U.S. sportsbooks will draw $31.4 billion in NFL handle this season, marking the first expected decline as regulated prediction market platforms capture volume previously held by traditional sportsbooks. H2GC estimates that sports event contracts across U.S.-facing prediction market venues carried handle equivalent to roughly $7 billion in 2025, compared with $184 billion in traditional sports betting. The report frames prediction markets as riding World Cup momentum into the NFL season.

Kalshi has listed new prediction markets for US Open men's singles matches, including Paul vs Alcaraz in the round of 16 and Khachanov vs Bonzi in the round of 32. The listings allow users to track implied odds or trade match outcomes. Separately, Polymarket traders have priced Mirra Andreeva at 65.5% to win her WTA match against Coco Gauff, up from 45.5% an hour earlier. Kalshi traders had previously priced Gauff a 74% favorite over Iva Jovic in their round of 16 matchup, with Aryna Sabalenka as the platform's title favorite.

LeBron James has partnered with Polymarket after his endorsement deal with DraftKings expired. The NBA star teased the CFTC-regulated platform in a viral X post and video after visiting Polymarket headquarters. The football-focused campaign gives Polymarket its largest athlete partnership to date, following deals by Giannis Antetokounmpo, Bryson DeChambeau, and Lionel Messi with prediction market services. James' free agency had already generated $273 million in prediction market volume across platforms.

Underdog is surrendering its daily fantasy sports licenses in seven states and filing federal lawsuits against five states to shield its prediction market platform from state gambling enforcement. CEO Jeremy Levine said the company was forced to choose between maintaining state fantasy licenses and offering its CFTC-regulated prediction market products. The lawsuits, filed Tuesday, Sept. 8, seek to establish that Underdog's sports event contracts fall under federal commodities law rather than state gambling regulations.

Actress Sydney Sweeney appears nude in Novig's first national advertising campaign, which launched ahead of the NFL season. Sweeney also holds an equity stake in the sports-focused prediction market platform. The deal values Novig at $500 million. The provocative spot has drawn public backlash, placing Novig at the center of a broader prediction market advertising controversy. The campaign was posted online Wednesday.

Kalshi traders price the Los Angeles Rams as Super Bowl favorite at 17%, with the Buffalo Bills and Seattle Seahawks next at 8% each. The platform also published Week 1 NFL power rankings for the 2026 season and priced a Seahawks-Patriots matchup at 61% for Seattle. Deadspin highlighted the Patriots-Seahawks and Rams-49ers markets as ones to watch in Week 1. Kalshi's middle-of-league pricing is described as an open field.

An analysis of Kalshi's own trade data finds sports and crypto contracts made up 95% of August volume, complicating its 'swap' defence.

A divided Third Circuit ruled September 8 that Kalshi's sports-event contracts likely qualify as swaps under the Commodity Exchange Act. The determination marks a significant appellate-level classification of Kalshi's products under federal commodities law. Separately, Iowa gaming regulators are challenging the same contracts, arguing they belong under state gaming authority rather than federal commodity regulation. The disputes center on whether Kalshi's offerings fall under CFTC oversight or state-level gaming commissions.

Kalshi FC posted Ballon d'Or winner odds on X on the eve of the nominee announcement, with Harry Kane leading at 65%. A day later, the same account noted Kane's probability had slipped to 61%, a 7% decline, while Lamine Yamal sat at 19% and Kylian Mbappé at 14%. The posts framed the figures as current chances of winning via Kalshi markets. No trading volume or liquidity data accompanied either update. Separately, a Reddit user in a Hell's Kitchen community asked whether others use Kalshi to trade on the cooking competition, with no market data attached.

Alexander Zverev surged to 44% probability on Kalshi to win the US Open men's singles title following Ben Shelton's upset of Carlos Alcaraz on September 8, 2026. Zverev is scheduled to face Botic van de Zandschulp in the quarterfinal. Prior to the match, Kalshi traders had priced Alcaraz as the heavy favorite over Shelton. A Kalshi trader held an $888,234 position on Shelton that paid out $3.8 million after the upset.