His pro career extended from 1942 to 1954, with the 1943–1945 seasons missed because of his World War II service in the United States Navy.

[2] He was a successful minor-league hurler in the Brooklyn farm system, notching 13 or more victories six times in the seven seasons spanning 1946 to 1952.

McGlothin made the Dodgers' 1949 early-season roster and appeared in seven games, all in relief, between April 25 and May 13.

Dodger starting pitcher Ralph Branca exited the game for a pinch hitter in the fourth inning, trailing 4–3.

[3] He appeared in one game in 1951 on April 18, when he was ineffective in a mop-up assignment against the Philadelphia Phillies.