Off-hand, I can't think of any other competitive instances. There is footage of him decking a sparring partner with his right. No argument here. But Norton demonstrated that Cooney wasn't completely impotent with it.
Ingemar Johansen didnt have just one good hand. He had just one good punch!!!!! His short right. That one punch thrown with that one hand got him to the title and won it for him.
Mike Weaver seemed to score most of his damage with the left hook. Carl Williams would certainly confirm - thats the Truth !
Patterson was counting on that expectation. Ingo's use of a jab threw Floyd off the same way Coetzee's jab later would throw off Mike Dokes. Ingo wasn't a bad ring general either. With Machen, he cleverly retreated and retreated, drawing Eddie into a trap he couldn't escape from once he sprung it. Fans widely assume Liston would have taken him apart, but Johansson had a pair of 13 round knockout wins on his ledger, and generated a huge lead before Joe Erskine's corner threw in the towel. Erskine was a 15 round veteran who would decision Willie Pastrano within a year, and nobody had ever been able to finish ahead of him on points before, let alone compile a completely insurmountable margin. Ingo would clearly not have attempted to confront Sonny head on the way Floyd suicidally did. He'd patiently and cautiously bide his time, and draw Liston in once he had Sonny convinced he was just another frightened target cowering away in paralyzed terror. Ingo could not have taken Sonny's best shot. But in watching Liston/Machen, I noticed something interesting. The hardest scoring punches in that 12 rounder were delivered by Eddie, not Sonny. At the outset of one of the rounds (the eighth, if memory serves), Machen nearly dropped Liston with a blistering hook, for what would have been Sonny's first knockdown since Marshall II. Ingo's right would have knocked Sonny on his ass in that instance. The great irony of Liston/Machen is that the harder hitting Liston won by outboxing Machen, while the lighter hitting Eddie managed to outpunch Sonny in a losing effort. While I'm not saying who would have taken Ingo/Liston, it's Johansson who would have to be given the puncher's chance. Nobody else ever came close to wiping out Machen like that. Who's to say he wouldn't have abruptly blitzed Sonny the same way?
..if ingo landed his besr punch on liston, liston wouldn't even know it until the corner men told him between rounds.