Shane Carwin almost did. That was as close as anyone will get for a long time. Lesnar is a machine that keeps getting better and better. There doesn't seem to be any other heavyweights out there that could beat Lesnar. Velasquez no, Dos Santos no, Overveem no, Fedor no. Fedor missed his chance, should've took it while Lesnar was still learning to fight. If Fedor were to ever fight in the UFC, Lesnar will be to dam good by the time he gets there. But theres always someone out there who is bigger and better. Theres got to be a guy out there to take Lesnar out?????