The 1970 American League Championship Series was a match-up between the East Division champion Baltimore Orioles and the West Division champion Minnesota Twins. Like the year before, the Orioles swept the Twins three games to none. The Orioles went on to win the World Series against the Cincinnati Reds. (Note: Owing to a one-day strike by major league umpires, the series was begun using AL supervisor Berry, veteran umpire Stevens—who had been used in a substitute capacity in 1970—and minor league umpires Deegan and Satchell, with the regularly assigned crew returning for Games 2 and 3.)