Ive just watched a video that goes through Ian Darkes top 10 KO's. They are:

10. Razor Ruddick Vs Michael Dokes
09. Joe Frazier Vs Bob Foster
08. Bob Foster Vs Dick Tiger
07. Jersy Joe Walcott Vs Ezzard Charles
06. Naseem Hamed Vs Said Lawal
05. Sonny Liston Vs Floyd Patterson
04. George Foreman Vs Ken Norton
03. Earnie Shavers Vs Jimmy Ellis
02. Ray Robinson Vs Gene Fullmer
01. Mike Tyson Vs Michael Spinks

I have to say that I disagree with some of those