Dauer played in the 1979 postseason, and Orioles defeated the California Angels in four games in the best-of-five 1979 American League Championship Series to secure the pennant, Baltimore's first since 1971. In the World Series, the O's built 3-1 lead, then lost the last three games to the Pittsburgh Pirates. He also played in the World Series in 1983, also known as "the I-95 Series," won by the Orioles over the Philadelphia Phillies in five games.