After the half way mark Spinks starts to get overpowered and is eventually steamrolled. Too much pressure and sustained physical strength
THis seems to keep being posted as a thread ... that being said, a very competitive fight .. the Spinks that defeated had the size, speed, strength and power to make a very competitive fight and test Marciano more than he was ever tested ... however, over 15 you have to believe Marciano's strength and power would wear him down ... as always, so much would depend on things like what sort of fight the ref allows them to fight and the ring size ..
IMHO this Jinx nut-hugging has me riled. IMO Eddie Gregory was a better fighter than Spinx. And (if his stupid head was on straight)would rate higher than the Rock ATG at weight. But of course that's just my opinion.