Marvin Hagler (1954–2021) was the undisputed middleweight champion of the world for seven years and is widely regarded as the greatest middleweight of the modern era.

Career Highlights

• Professional record: 62 wins, 52 by KO, 3 losses, 2 draws
• Undisputed middleweight champion from 1980 to 1987
• 12 successful title defenses

Legacy

Hagler was a relentless southpaw with a granite chin, tremendous power in both hands, and an engine that never quit. His three-round war with Thomas Hearns in 1985 is frequently called the greatest round in boxing history.

Reference:

Wikipedia: Marvin Hagler

https://en.wikipedia.org/wiki/Marvin_Hagler