On February 9, 1920, the major leagues announce a rule change banning all “freak deliveries” by pitchers. The new rule outlaws pitchers from using grease, saliva, sandpaper, and other foreign substances on baseballs, except for 17 known “spitball” pitchers. They will be allowed to use the outlawed substances until their careers end.
Houston owner Judge Roy Hofheinz votes along with the rest of the National League to allow the American League to conduct a three-year experiment using the Designated Hitter. It will be the first time since the A.L. was formed in 1901 that the two major leagues would have a different set of rules. The gimmick has survived ever since and is now used by National League teams when involved in interleague play.
January 11, 1973
April 3, 1985
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