5A: The two teams have faced each other five times in the postseason, with the Yankees winning the 1999 and 2003 ALCS, and the Red Sox winning the next three matchups (2004, 2018 and 2021).

MLB has since expanded its playoff format to six teams – three division winners and three wild cards – in each league, giving even more clubs a chance to reach the championship series.

The ALCS winner takes home the William Harridge Award. Harridge was the AL president from 1931 to 1959 and was posthumously elected into the Baseball Hall of Fame in 1972.