- Dec 10 John Heyder becomes president of baseball's National League for the 2nd time
Dempsey vs. Morris
Dec 16 Jack Dempsey KOs Carl Morris in 14 seconds
Vezina 1st Assist
Dec 28 Montreal's Georges Vezina becomes the first NHL goalie to record an assist during the Canadiens’ 6-3 win over the Toronto Arenas
- Dec 31 Kid Gleason replaces Pants Rowland as Chicago White Sox manager; reach World Series but lose in the "Black Sox" betting scandal; Gleason not involved