Ronald Acuna Jr. Partnered With Prediction Market Kalshi

The MLB star has joined forces with Kalshi as a brand ambassador amid a broader league-wide expansion.

Updated on Oct. 8, 2026 in Baseball

Expressive editorial sports illustration of a baseball player swinging a bat, capturing the energy of professional sports in navy blue and red. — MLB star Ronald Acuña Jr. has signed a brand ambassador deal with prediction market Kalshi, marking a new venture into sports betting partnerships for the league. AI Illustration. Upload story photo >

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Ronald Acuna Jr. has become the first MLB player to sign a partnership deal with the prediction market company Kalshi. The deal debuted with a television advertisement during the playoff game between the Atlanta Braves and the Los Angeles Dodgers.

Why it matters

Sports leagues and teams are aggressively pursuing new revenue streams through prediction market partnerships, even as regulatory scrutiny remains high. The move highlights the tension between rising commercial interest in betting platforms and strict league-wide prohibitions on wagering.

Five Major League Baseball teams have previously established partnerships with Kalshi. While players are currently restricted from trading on their own leagues, the company is reportedly in discussions with MLB regarding a comprehensive league-wide deal.

The players

Ronald Acuna Jr.

He is a professional baseball outfielder who has become the first MLB player to partner with a prediction market platform.

Kalshi

It is a prediction market company currently facing litigation from the New York attorney general over alleged illegal gambling operations.

Emmanuel Clase

He is a professional baseball player who was indicted and arrested in November 2025 following an investigation into wager rigging.

Luis Ortiz

He is a professional baseball player who was indicted in November 2025 for his involvement in an alleged gambling scheme.

The details

Acuña now serves as a brand ambassador, appearing in commercials for the platform. This partnership follows similar industry moves by high-profile athletes such as Bryson DeChambeau, Giannis Antetokounmpo, and Lionel Messi.

July 2025: Emmanuel Clase and Luis Ortiz were placed on paid leave.
Late 2025: MLB issued a memo prohibiting baseball event wagering.
November 2025: Clase and Ortiz were indicted and arrested.
February 2026: Kalshi announced a deal with Giannis Antetokounmpo.
October 7, 2026: An Acuna commercial aired during the Braves-Dodgers game.

Season Trajectory

This deal follows the strict MLB prohibition on baseball event wagering, which was formalized in a late 2025 memo to address integrity concerns. The ongoing tension between these commercial partnerships and league rules continues to shape the competitive landscape for players and teams.

MLB rules explicitly prohibit players from trading on their own leagues, meaning the partnership is strictly commercial rather than participatory. The ongoing legal challenge from New York authorities regarding the legitimacy of prediction markets could further influence the future of these contracts.

The takeaway

While athletes are increasingly signing marketing deals with betting platforms, the legal and regulatory landscape remains volatile. Readers should note that league-wide rules regarding wagering engagement for players are strictly enforced despite these lucrative corporate endorsements.