Cy Young threw the first perfect game in American League history on May 5, 1904. In the game, Young led the Red Sox to a 3-0 victory over Rube Waddell and the Philadelphia A’s. It also marked the first perfect game in the majors since 1893, when the distance from the mound to the plate was changed from 45 feet to 60 feet, 6 inches.
“Cy Young” by Bain News Service