That opponent, of course, is Fedor Emelianenko, who is widely regarded as the best heavyweight in the world, but who has never fought in the UFC because he won't agree to the UFC's contractual demands. A Fedor vs. Lesnar fight would be the biggest heavyweight fight in MMA history, and UFC President Dana White said after UFC 100 that he's confident he can make it happen.
And although Fedor still has one more fight on his current contract with Affliction (an August 1 bout against former UFC heavyweight champion Josh Barnett), White is already looking ahead toward getting Fedor into the Octagon and giving him a shot at the UFC heavyweight champion in his first bout.
"This guy just became the heavyweight champion," White said, gesturing to Lesnar. "We'll end up getting that deal done. And then we'll do Brock vs. Fedor, and it'll be a huge fight."
It would be a huge fight. And it would be a fight in which Fedor, despite a size disadvantage of around 50 pounds, would be favored to win.