What do you mean who's the most difficult fight for him. We already know that all he has to do is survive 12 to win. I believe he can go 12 with anyone at middleweight. I don't see anyone knocking him out.
Fair enough man i mean who is the most difficult fight that can and should be made for the progression of his career?
Floyd fight he lost the clearest but he just got outboxed fairly non-eventfully. GGG was the more grueling, hard fought match. I'd add Trout to the list as well.
Well given that there's fairly widespread feeling that he lost twice to GGG, a third match-up there would probably be his most difficult challenge, at least at MW.