 Marrero finished his major league career with a 39–40 record and a 3.67 ERA, which was eight percent better than the league average (after adjusting for ballpark differences).He pitched 51 complete games, including seven shutouts, in his 94 starts.He was selected to the 1951 American League All-Star team, though he didn't play; at age 40, he was the oldest first-time All-Star to that point.