From a New York Times story by Jonathan Abrams headlined “His Night of Baseball Fame Has Lingered for 70 Years”:

BELLE VERNON, Pa. — Seventy years ago, Ron Necciai accomplished a feat that no other professional pitcher — not Walter Johnson, not Bob Gibson, not Nolan Ryan, not anyone — ever managed: He struck out 27 hitters in a nine-inning game. The major league record for strikeouts in a nine-inning game, achieved four times, is 20.

It was May 1952, and Necciai, 19, had no clue what he had achieved in his no-hitter until his manager informed him and his catcher, Harry Dunlop, after the game.