On February 15 1940 — The Detroit Tigers’ roster lists Hank Greenberg as an OF. The willingness of the team’s leading power hitter to switch, at a contract boost, from 1B allows manager Del Baker to find a position for Rudy York. Also on the list are Dick Bartell, picked up from the Chicago Cubs for Billy Rogell and Pinky Higgins, who had been shopped around. The four, along with Barney McCosky and Charlie Gehringer, produce the stuff that will move the Tigers from fifth to first, although its .588 mark will be as low as that of any pennant-winner yet.

 

Greenberg Will make baseball history when they moved him from first base to the outfield. The Detroit slugger went on to becomes the first player to earn MVP awards at two positions.

https://baseballhall.org/discover/inside-pitch/hank-greenberg-moves-to-left-field