After Triston Casas was ruled out for the rest of the season due to a knee injury, Devers was asked by the Red Sox to take over defensive duties at first base, which is something he's never done for Boston at the MLB level.

The Boston Red Sox were perfectly justified in asking Rafael Devers to vacate third base for Alex Bregman and become a designated hitter. They are far less justified in asking Devers to switch again,

Red Sox Trade Sends Rafael Devers to New York Amid Boston's First Base Drama. Devers Refuses to Play First Base.