One shot? Marciano v Walcott. Ko of any kind...buster vs Tyson or maybe Ali vs foreman. Tko.....foreman frazier
I've been holding this in for years.. I was thoroughly disappointed with that fight after hearing so much about it. Definitely a war but not in my eyes the go to fight
Need some context, we talking significance of KO or just KO based on brutality. For significance it's hard to beat Louis - Schmelling II
Never been a big fan of Joe Bugner, but watch his 1976 fight with Richard Dunn. The bout is not in a Frazier/Ali/Foreman class, but Bugner was fired up for this fight, and did a job on Dunn. Have a look at it on youtube and make your own mind up. Quarry-Shavers was good while it lasted too. First Foreman-Frazier was good.
:thumbsup In terms of significance Louis - Schmeling ll will probably never be beaten. Whilst not a true ko, the fact that Max's corner chose to jump into the ring to prevent a ten count (and basically surrender) makes it even more memorable. Hearns - Duran was as great a "Knocked Out" as I can remember... but being a huge Hearns fan, l am probably biased ( I don't think i'll torture myself and watch Hagler-Hearns again). In terms of sheer mouth-open, wide eyed "wtf just happend?" complete turn of events with one shot, Jackson's starching of Graham is hard to beat.