Kansas City Royals right fielder Jac Caglianone settles in a second base after hitting a double for his first hit in Major League Baseball on Thursday, June 5, 2025 against the Cardinals at Busch Stadium in St. Louis. Jeff Curry Imagn Images

The Jac Caglianone era is underway for the Royals. Tuesday evening, Kansas City's No. 1 prospect made his big-league debut against the St. Louis Cardinals at Busch Stadium after only 79 minor-league games.

The Royals’ best prospect since Bobby Witt Jr. is on his way to the Major Leagues, as the club called up top prospect Jac Caglianone on Monday morning. It sets the stage for the slugging first baseman/outfielder’s big league debut on Tuesday in St.