On May 13, 1980, Marvin Hagler delivered his 31st knockout in dominant fashion — stopping Doug Demmings in just 3 rounds at the Boston Garden. Known for his relentless pressure and switch-hitting mastery, Hagler wasted no time cutting off the ring and breaking Demmings down. Every punch had purpose — calculated, violent, and precise. This performance added fuel to Hagler’s campaign for the world title — and showed the boxing world that ‘Marvelous’ was more than just a nickname. He was a storm co