Major League Baseball has partnered with Polymarket, an official prediction market exchange partner, on March 19, a move the league states will enhance game integrity while acknowledging the unregulated nature of prediction markets. This alliance lends legitimacy to platforms like Polymarket and its rival Kalshi, which allow betting on diverse global events beyond traditional game outcomes, including elections and geopolitical incidents. The partnership grants Polymarket exclusive access to MLB branding, official league data, and promotional opportunities, aiming to establish a comprehensive integrity framework. This development occurs as MLB faces its own integrity crisis, with players implicated in pitch-rigging schemes, and as prediction markets like Kalshi face legal challenges, such as Arizona's criminal charges for operating an illegal gambling business.