Considering that the official boxing world championships started in 19th century, the list of undefeated boxers is surprisingly short. Recently-retired Floyd Mayweather Jr. is only the fourteenth world champion to withdraw without a single defeat. It’s a rare feat that deserves a closer attention and scrutiny.
Undefeated Boxers: Rocky Marciano
Rocky was one of the greatest. He was the inspiration for the name, image, and fighting style of Rocky Balboa from Sylvester Stallone’s classic Rocky movie series. Boxing historians often neglect to put Rocky in with the big ones like Dempsey or Louis, but it’s not really fair, since he did beat everyone who crossed his path.