Byrd KOd Jimmy Thunder! A crude opponent but one that would knock Marciano out real fast. Marciano couldn't carry Byrd's jockstrap. Fact!

And Valuev! Ha. As IF Marciano could beat Valuev! Look at them!

Anyway this is not a h2h ranking, we can compare that another time. This is a record of HW title fights, an indication of "greatness" you might say. Of course cutting out all the old time nutbaggery to give a more accurate assessment!