Maybe I went to far with the no chance. Unlikely seems better fitting. Machen only won the odd round in my book. I don't think you can really use him as a blueprint as to why Ali would beat Liston.
You did see things in that fight that would come back in the Ali fight. Liston's tendency to follow in straight lines rather than cut the ring off, for instance. Movement off-set much of Liston's offence in both fights.
