I already took him straight up. I don't like to try to narrow down a finish, it doesn't work for me.
The thing is that Werdum is very hard to put away, he has only been stopped once in his career, by JDS. He is very hard to gnp, so Reem really needs to put the lights out standing to get a stoppage. Even though Overeem hits like a truck, it is usually more death by bludgeoning... he has the knees, but it usually is not just knocking someone dead with a precision shot. I do worry about the knees though. Werdum is going to be looking to to tie him up, and Overeem will be throwing knees like a wildman. Probably in the junk and elsewhere. But Werdum does get rocked all the time standing, it just that he recovers pretty quickly and his posture control from guard is so good that it is hard to hurt him from top.
Since Overeem has always wilted as fights wear on, I am banking on survival from Werdum and then turn the tide later in the fight. Still, in good conscience, I have to admit that Overeem is probably going to win. Is it a 5 rounder?

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