Suggested by iKnowledge Euron is a master hand to hand combatant who also has a high resistance to pain. As he can laugh off normal stab wounds it is safe to say that he is almost super human. It’s unlikely that Stannis would be able to defeat him. Euron would die to a full stab of course, but since glancing blows won’t work too well Stannis will just be overwhelmed. He simply won’t be able to last against such an opponent. Euron Greyjoy wins.