Daily fantasy sports (DFS) operator DraftKings has become the ‘official daily fantasy game’ of Major League Baseball (MLB).

On Thursday, DraftKings announced a “multi-year expansion of its exclusive partnership” with MLB, which took an undisclosed equity stake in DraftKings two years ago. The announcement comes just days before Sunday’s commencement of the 2015 MLB season.

The partners’ new relationship will include co-branded MLB DFS games plus “unique games and fan experiences.” DraftKings will enjoy extensive promotion across MLB properties, including MLB.com, live sports streaming service MTL.TV, the MLB Network and the league’s official social media properties. DraftKings will also enjoy a highly visible presence at MLB ballparks and plans to partner with individual MLB franchises on “once-in-a-lifetime, market-specific in-ballpark experiences.”

DraftKings is already the official DFS provider for the National Hockey League. Rivals FanDuel have struck an exclusive deal with the National Basketball Association that allowed the NBA to take an undisclosed equity stake in FanDuel.