Shane Carwin
Lesnar would just sit on him and deliver 50 hammer fists before Carwin can get a punch in. I don't like Lesnar's attitude and he has no class but give the guy credit, he beat Mir like it was nothing. Carwin, Fedor etc. won't be able to beat lesnar since they can't match his strength. It wouldn't even matter if they were faster, since once Lesnar takes them down, speed would be a non-factor. If this was boxing, then Fedor or Carwin would have the ability to beat Lesnar but it's not.