Mazeroski was a key member of two Pirates World Series championship teams. He and Roberto Clemente were the last remaining team members from the 1960 World Series winners in , when they beat the favored Baltimore Orioles in seven games. Mazeroski spent his entire playing career with the Pirates before he joined the staff of manager and ex-teammate Bill Virdon as a third base coach in the 1973 season. He served in the same capacity with the Seattle Mariners in the 1979 and 1980 campaigns.