Here is a list of Marciano's best fights.
On June 17, 1954 Rocky Marciano met Ezzard Charles in a heavyweight (The Ring) world-title defense fight. Marciano was 30 years old and with a record of 46-0 (40), and Charles was 32 years old and with a record of 85-10-1 (48). Marciano won the fight via 15-round unanimous decision and successfully defended his title.
On October 26, 1951 Rocky Marciano faced off against Joe Louis at age 28. He was coming in with a record of 38-0 (33), and Louis was 37 years old and with a record of 66-2 (52). Marciano stopped Joe Louis via TKO.
On September 17, 1954 Rocky Marciano met Ezzard Charles in a heavyweight (The Ring) world-title defense fight. Marciano was 31 years old and with a record of 47-0 (41), and Charles was 33 years old and with a record of 85-11-1 (48). Marciano stopped Ezzard Charles via 8th-round KO and successfully defended his title.
On September 21, 1955 Rocky Marciano met Archie Moore in a heavyweight (The Ring) world-title defense fight. Marciano was 32 years old and with a record of 49-0 (43), and Moore was 41 years old and with a record of 149-19-8 (108). Marciano stopped Archie Moore via 9th-round KO and successfully defended his title.
On September 23, 1952 Rocky Marciano fought Jersey Joe Walcott in a heavyweight world-title fight for Walcott's The Ring title. Marciano was 29 years old and with a record of 43-0 (38), and Walcott was 38 years old and with a record of 51-16-2 (32). Marciano stopped Jersey Joe Walcott via 13th-round KO and is crowned the new heavyweight world champion.
On May 15, 1953 Rocky Marciano met Jersey Joe Walcott in a heavyweight (The Ring) world-title defense fight. Marciano was 29 years old and with a record of 44-0 (39), and Walcott was 39 years old and with a record of 51-17-2 (32). Marciano stopped Jersey Joe Walcott via 1st-round KO and successfully defended his title.