Rosario last saw action on a Major League field in 1972, appearing in only seven games for the San Francisco Giants, the team he came up with just one season before as a 26-year-old rookie.
In 1976 he was now a member of the Milwaukee Brewers, and proceeded to hit .189 in limited play, collecting what would be the last seven hits of his brief career over 37 at-bats, scoring four runs and driving in five in 15 games.
The following year he would go on to the Japanese League where he’d play for the Crown Lighter Lions before playing out his pro career with five seasons in the Mexican League until the age of 37 in 1982.