I'll go with Jack Dempsey against Jess Willard, man he fucked up that giant real bad!

Dempsey against Luis Firpo, crazy action.

There was a brilliant Jack Johnson fight where he was fighting this little short guy who knocked out Dempsey early in his career Britkid will know who I mean, anyways it was an actual example of a big tall man holding a little dwarf at arms length with one hand and punching him repeatedly in the face with the other!

I guess you have to say the Ali Frazier trilogy.

Ali Foreman also was one hell of a fight, Ali's finest hour,

Tyson's demolition of Michael Spinks also must rank pretty high.

And purely because I love seeing him get knocked out, Hasim Rahmans KO of Lennox Lewis.