I think it's a bit disappointing that Henry cooper didn't find his way on to the list.
He did put Ali on his backside, which was a very rare occurrence, with 'Enery's 'Ammer.
Not the greatest left hook ever but worthy of going on the list.

For my money the hardest left hook would come down to Smokin' Joe and David Tua.
I'm gonna go with David Tua by a whisker, and I wonder if we could ask John Ruiz to come on board and see what he thinks about who has the best lef hook in history. Thats if he can spare time from his busy courtroom schedule. :P
Tua's on the comeback trail, do you think Ruiz will give him a rematch.