The 1971 season saw Duncan become the Athletics main catcher, as he guided their pitching staff to the second best earned run average in the league as they finished the season with two twenty-game winners (Vida Blue and Catfish Hunter).
The 1971 season saw Duncan become the Athletics main catcher, as he guided their pitching staff to finish second in the league in earned run average as well as in strikeouts as well as in earned run average. Duncan would catch for two twenty-game winners that season (Vida Blue and Catfish Hunter).