October 8, 1956

Don Larsen of the NY Yankees pitched the first and only perfect game of the World Series.

Don James Larsen was an American professional baseball pitcher. During a 15-year Major League Baseball (MLB) career, he pitched from 1953 to 1967 for seven different teams: the St. Louis Browns / Baltimore Orioles (1953–54; 1965), New York Yankees (1955–1959), Kansas City Athletics (1960–1961), Chicago White Sox (1961), San Francisco Giants (1962–1964), Houston Colt .45’s / Astros (1964–65), and Chicago Cubs (1967).

Larsen pitched the sixth perfect game in MLB history in Game 5 of the 1956 World Series. It is the only no-hitter and perfect game in World Series history and is one of only two no-hitters in MLB postseason history (the other being Roy Halladay’s in 2010). He won the World Series Most Valuable Player Award and Babe Ruth Award in recognition of his 1956 postseason.

https://en.wikipedia.org/wiki/Don_Larsen