platoon advantage (1957)

“With seven outfielders, four of whom as lefthanded swatters, [Dick] Sisler certainly would be able to platoon to advantage, if he desires, and also to rest older players and strengthen the pinch-hitting department.” George Leonard, “Vols Likely to Have Seven Outfielders When Season Starts,” Nashville Banner, March 19, 1957, p16

No earliest use given in 2009 Dickson Baseball Dictionary