"The Brockton Blockbuster" Rocky Marciano on BoxRec: https://boxrec.com/en/proboxer/9032

49-0-0, 43 KOs (11 knockouts in the very first round).

Heavyweight champion of the world 1952-1956 (last title defense against Archie Moore in September 21, 1955; announces retirement in 1956).

Arguably one of the greatest heavyweight champions of all time.