Marvin Hagler legally changed his name to "Marvelous Marvin Hagler" after becoming frustrated that announcers did not refer to him by his nickname.

He was known for his exceptional chin, never being knocked out in his professional career.

Hagler's fight against Thomas Hearns is often regarded as one of the greatest fights in boxing history due to its intense and aggressive nature.

After retiring from boxing, Hagler moved to Italy, where he became an actor and appeared in several action films.

He passed away on March 13, 2021, at the age of 66.

Undisputed Middleweight Champion (1980–1987)

The Ring World Middleweight Champion (1980-1987)

Made 12 successful title defenses, with 11 wins by knockout

Vs. Alan Minter (September 27, 1980): Won by TKO in the 3rd round to become the Undisputed Middleweight Champion.

Vs. Roberto Durán (November 10, 1983): Won by unanimous decision, successfully defending his middleweight titles.

Vs. Thomas Hearns (April 15, 1985): Won by TKO in the 3rd round in a bout famously known as "The War."

Vs. John Mugabi (March 10, 1986): Won by TKO in the 11th round, marking his 12th successful title defense.

Vs. Sugar Ray Leonard (April 6, 1987): Lost by split decision in a highly controversial fight, which was his final professional bout.