Fabricio Werdum has faced Alistair Overeem twice thus far in his career, and is 1-1 against him. The UFC heavyweight title contender was recently asked by MMA Fighting what he thought of Overeem, who has dropped his last two fights in the octagon, and he was quite candid about The Reem not being the same fighter with out his "juice":
"He lacks a little bit in gas because of his steroids," Werdum told MMAFighting.com. "He changes a lot if you take his juice off. Everybody saw what happened. Overeem is one fighter with his juice, but he changes completely without the juice. They took his powers."
"Let’s see how he does against Frank Mir, if he changed his strategy or training," he said. "Frank Mir is not doing well recently too, but I believe Overeem will defend the takedowns and knock him out. Overeem is a good fighter, but let’s how he does without his juice."
He also makes it quite clear that while he doesn't like him, he definitely respects his accomplishments:
"I don’t like Overeem very much," Werdum said. "Not because of the fact that we fought, but I think he’s too cocky. But he’s a good fighter, a strong guy, a good striker. I respect him for everything he has done in MMA and K-1."
I highly doubt we'd ever see the rubber match between the two in the UFC (especially since their second fight was so horrible), but stranger things have happened. Werdum currently doesn't have a fight booked, and has his eye on facing the winner of the UFC 166 main event between Cain Velasquez and Junior dos Santos. Overeem meets Mir at UFC 169 in February.