In 1967, Popowski was promoted to the parent Red Sox as third-base coach under
Dick Williams. That season, the Red Sox, who had finished ninth in the ten-team
American League in 1966, stunned the baseball world by winning their first pennant since 1946. Popowski was Boston's third-base coach for seven seasons, through 1973. and
Eddie Kasko in
1973, the latter for only one game. Popowski won six of the ten major league contests that he managed. Popowski remained on Boston's MLB staff under new manager
Darrell Johnson as first-base coach in 1974, and was a special assignment coach in 1975, when the Red Sox once again won the American League pennant. He was a bench coach for the Red Sox during the
1975 World Series. In 1976, Popowski began the year as a minor league instructor but he returned to the Boston coaching staff to fill the vacancy created July 19 when
Don Zimmer was promoted to manager after Johnson's firing. Popowski coached at third base for part of the season, and in the dugout.
Managerial record ==Active in baseball for 65 years==