MLB has its most productive class of rookie hitters ever. Managers and players believe they know why

Baltimore Orioles' Gunnar Henderson waits for a pitch from the Washington Nationals during the fifth inning of a baseball game, Wednesday, Sept. 27, 2023, in Baltimore. (AP Photo/Julio Cortez)

Houston Astros' Yainer Diaz celebrates in the dugout after hitting a two-run home run against the Baltimore Orioles during the sixth inning of a baseball game Tuesday, Sept. 19, 2023, in Houston. (AP Photo/David J. Phillip)

Minnesota Twins’ Matt Wallner grounds into a double play during the sixth inning of the team’s baseball game against the Oakland Athletics Thursday, Sept. 28, 2023, in Minneapolis. Teammate Willi Castro scored on the play. (AP Photo/Andy Clayton-King)

Minnesota Twins' Edouard Julien scores on a wild pitch by Cincinnati Reds relief pitcher Derek Law in the eighth inning of a baseball game in Cincinnati, Tuesday, Sept. 19, 2023. (AP Photo/Jeff Dean)

Arizona Diamondbacks' Corbin Carroll runs after hitting a two-run double during the third inning of a baseball game against the Chicago White Sox in Chicago, Wednesday, Sept. 27, 2023. (AP Photo/Nam Y. Huh)

Minnesota Twins' Royce Lewis celebrates in the dugout after scoring on single from Carlos Correa during during the eighth inning of a baseball game against the Chicago White Sox, Saturday, Sept. 16, 2023, in Chicago. (AP Photo/Erin Hooley)

MINNEAPOLIS (AP) — Royce Lewis has played in 70 games for the Minnesota Twins. He has five grand slams.