He threw the only immaculate inning in postseason history … and didn’t know until 30 years later

Danny Jackson threw the only immaculate inning in postseason history during Game 5 of the 1985 World Series but did not realize it until 30 years later. Pitching for the Kansas City Royals against the St. Louis Cardinals, the left-hander struck out Terry Pendleton, Tom Nieto, and Brian Harper on nine consecutive strikes in the seventh inning. Jackson only discovered his achievement when a trivia question appeared on the Kauffman Stadium scoreboard in 2015.

The feat went unnoticed during the original broadcast because the term immaculate inning had not yet entered the baseball lexicon. Jackson's dominant outing helped propel Kansas City to a 6-1 victory, sparking a comeback from a 3-1 series deficit to win the championship in seven games. Teammates and opponents alike, including batter Brian Harper, only recently learned about their involvement in the historic event.