On July 19, 1975, New York Yankees catcher Thurman Munson is ruled out for using an illegal bat that has too much pine tar. The umpire’s ruling, which is based on the pine tar exceeding the 18-inch limit, negates Munson’s first inning RBI single against the Minnesota Twins.
American League votes to allow all existing spitball pitchers to continue throwing the “illegal” pitch
December 17, 1920
September 4, 1991
National League President Warren Giles rules that the final score of the near perfect game thrown by the Pittsburgh Pirates’ Harvey Haddix should be 1-0
May 27, 1959
August 18, 1983