Is Buster Douglas KO Mike Tyson boxing's biggest upset ever?

[daggum]

no. calzaghe vs lacy was the biggest upset because lacy was the next tyson and calzaghe was just some skinny dude who was trained by a midget.

[joelab75]

yes. Tyson was on the top of the boxing world not just undisputed Champion but the most popular since Muhammad Ali. He was a beast, fastest heavyweight probably ever, and a one punch knock out artist. The fight was supposed to be for a show.