Rocky Marciano, born Rocco Francis Marchegiano, was an American professional boxer who competed from 1947 to 1955. He is widely regarded as one of the greatest boxers of all time and remains the only heavyweight champion to retire undefeated. Marciano's nickname was "The Brockton Blockbuster" due to his incredible punching power and his hometown of Brockton, Massachusetts. Other synonyms for Marciano include "The Punching Postman" due to his former job as a mailman and his devastating punch, "The Italian Stallion" due to his Italian heritage and incredible success in the boxing ring, and "The Greatest Heavyweight of All Time" for his undefeated record and impressive career statistics.