1981 ALCS

The A’s won three straight pennants from 1972-74, taking the World Series each time. The Yankees won three straight pennants from 1976-78 and grabbed two Series titles. But the teams’ paths had never crisscrossed in October. That changed when they met in the 1981 ALCS.
An interesting subplot was that Oakland’s revival was under the leadership of manager Billy Martin, who had also restored to the Yankees to prominence five years earlier.