Lemon remained in the game as a coach for the Twins, serving two different terms (1965–67; 1981–84) in that role, including with the 1965 pennant-winning team. In between, in 1968, he returned to Washington as manager of the expansion Senators, but his popularity as a player did not translate to a successful managerial record. His club finished last in the ten-team American League, winning 65 games and losing 96 (.404)—but it did feature a fearsome, right-handed power-hitter in Frank Howard. Lemon was fired after only one season.