On April 21, 1957 — Don Hoak of the Cincinnati Redlegs unwittingly brings about a change in the baseball rules. Leading off second base, Hoak intentionally interferes with an apparent double play grounder. Hoak is called out, but the batter is safe. A new rule will result: if a runner willfully interferes with a batted ball that could result in a double play, both the runner and the batter will be called out.

 


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Sources:

Baseball Reference April 21

SABR Games Project

National Pastime April 21

Hall of Fame

Retro Sheet