Vacant North American middleweight title · 12 rounds

Willie
Monroe
VS
Marvelous
Marvin Hagler

Hagler · TKO 12/12

Feb 15, 1977 · John B. Hynes Memorial Auditorium, Boston, 🇺🇸

Monroe going in—

Hagler going in30-2-1

Confirmation✓ one source

MethodTKO

Round12 of 12 · 1:20

TitleVacant North American middleweight title

Sources

English Wikipedia
side b · observed 2026-10-11
en.wikipedia.org/wiki/Marvelous_Marvin_Hagler

✓

✓