Former Green Bay Packers offensive tackle Cal Hubbard became an American League umpire on November 4, 1935. Hubbard would go on to become the only person to be enshrined at both the Pro Football Hall of Fame and the Baseball Hall of Fame. He is also a member of the College Football Hall of Fame.
On July 20, 1944, Nels Potter of the St. Louis Browns was handed a ten-game suspension, making him the first pitcher ever to be suspended for throwing a spitball. In a speech before the Society for American Baseball Research several years later, Potter stated, “The truth is I have never thrown a spitball in my life. It was a cool, dry night and we were playing the Yankees. I was using the rosin bag, Cal Hubbard said I couldn’t go to my mouth with my hands that night. I then blew on my hand. Cal said, ‘You can’t do that.’ I threw the ball in and said there was no rule that says you can’t do that. He kicked me out of the game and I got suspended for 10 days.” Potter returned to the Browns’ lineup on August 6 to win the second game of a doubleheader against the Indians, 6-4.