In doing so, Calgianone joined Bo Jackson as the only players in Royals history to record a four-hit game within their first six games as a big-leaguer, according to MLB Pipeline. The 22-year-old recorded three singles and a double in Sunday's win. After a slow start through his first five games, he was dialed in at the plate against the White Sox.

Perez atoned for his mistakes on Sunday. He led the way with an early home run as the Royals salvaged a 7-5 win in the series finale. There were other heroes, too: Jac Caglianone belted four hits — his first multi-hit game in the major leagues — and Bobby Witt Jr. hit his eighth homer.

Jac Caglianone’s Royals promotion has been called into question by former Miami Marlins president David Samson. While many Kansas City fans were elated that Caglianone, MLB.com’s No. 10 prospec t, was promoted to the show, Samson had the complete opposite reaction.

Kansas City Royals rookie Jac Caglianone has scouts and fans alike excited about his raw power, but he's far from the perfect prospect.

At spring training in Surprise, Arizona, George Brett was wowed by the phenomenon of top prospect Jac Caglianone — who all of a sudden will make his major-league debut on Tuesday in St. Louis. But what struck the Royals’ National Baseball Hall of Famer most was how riveted everyone else was.

Bobby Witt Jr and Jac Caglianone took a photo in front of a United airlines jet prior to Caglianone's debut against the Cardinals on Tuesday night