Who will have more gas in there tank?

Come rounds 9, 10, 11, 12 who will be coming on stronger? Who do you guys think will be the better conditioned and more likely to impose his will in these rounds? I think this is very important and even pivotal in this matchup. Because if Ricky gases and can't cut the distance quickly, get in and sustain pressure then he will be cut to ribbons. If PBF gases due to conditoning or Hatton's body work then he wont be able to keep Hatton off him and it will be all inside where Hatton does his best work.