As long as they both land solid shots on each other I will be happy. If Roy incorperates grappling into his gameplan I see him taking the decision. If he tries to slug with Mark I see Hunto winning the UD with better striking technique.
Hunt is not what he used to be physically, but Nelson is pretty one dimensional and plays into Hunt's style well (provided they keep it on their feet).
I guess I'm going to predict that Nelson deviates from his usual haymakers and pushes for a lot of takedowns and gnp. Hunt's never looked good on the ground against anyone noteworthy. Nelson by decision.