1928
- July 31- In an unprecedented move, Heavyweight Champion Gene Tunney retires from the ring, vacating the Heavyweight title after defeating Tom Heeney. Unlike James Jeffries before him, Tunney never returned to the ring.
- September 26- The National Boxing Association Heavyweight championship's vacancy is filled when Jack Sharkey defeats Tommy Loughran to take the title. Sharkey's title was not universally recognized, and in 1930 he would be defeated by Max Schmeling for the undisputed championship.
Read more about this topic: Boxing In The 1920s