15 rounds at middleweight. The power punching Valdez against the slick boxing of Graham. Graham, IMO has the skills, footwork and the chin to outpoint Valdez... I'd take Graham by UD (9-6) in rounds.
If Graham takes Valdez's shots, he wins. Would he? Who knows. He was never so much as put down, let alone KO'ed, but he also never faced a combination of power and skill like Valdez brings. Me? I'll back my man Graham for a 10-5 type of decision with a couple of knockdowns along the way decision which he gets up from.