Rocky Marciano is the only champion to hold the heavyweight title and go untied and undefeated throughout his career. These transparencies - two of which are in slide format - come from the same photo shoot for the September 19, 1955 Sports Illustrated cover. One slide comes from 1954 fight action. Nine are in 2.5" x 2.5" format and hail from an exclusive photo shoot held on August 4, 1955.