Marvelous Marvin Hagler has three losses against three opponents on his boxing record. For a list of Hagler's best fights, refer to "Best fights of Marvelous Marvin Hagler".
On April 6, 1987 Marvelous Marvin Hagler met Sugar Ray Leonard in a middleweight (WBC, The Ring) world-title defense fight. Hagler was 32 years old and with a record of 62-3-2 (52), and Leonard was 30 years old and with a record of 33-1 (24). Hagler lost the fight via 12-round split decision and lost the titles.
On March 9, 1976 Marvelous Marvin Hagler faced off against Willie Monroe at age 21. He was coming in with a record of 26-2-1 (20). Hagler lost the fight via 10-round unanimous decision.
On January 13, 1976 Marvelous Marvin Hagler faced off against Bobby Watts at age 21. He was coming in with a record of 25-1-1 (19). Hagler lost the fight via 10-round majority decision.