Surprised no one’s mentioned Hearns-Duran yet (unless I missed it). I’d add Cuevas-Jorgen Hansen and Leotis Martin-Sonny Liston.
Duran seemed to have left some business savvy after the KO or at least the entrepreneurial spirit https://www.goerie.com/news/20181229/ron-leonardi-bizzarro-boxing-gym-set-to-open-in-january https://www.facebook.com/Lou-Bizzarros-Ringside-Restaurant-135882539787513/ https://www.bizzarroschampionshipautorow.com/
Mercer had a lot of those. Almost like he cranks up his punches as the guy is out cold or near it. Hearns when he stopped Duran could have hit him again and he backed off and let him fall. I don't get making it worse.
I have to give it up for Foreman-Frazier. That was just...talk about looking invincible. I'm sure Dempsey fans here can think of another.