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 Kansas City Royals are calling up slugger Jac Caglianone, one of the top prospects in baseball, sources tell ESPN. Caglianone, 22, is hitting .322/.389/.593 with 15 home runs and 56 RBIs in 50 games between AA and AAA.