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This is where the fight would get interesting.
Lesnar would almost certainly get the fight to the mat and, once there, he'd look to unleash some of his ferocious ground-and-pound.
Fedor has shown weaknesses against big, strong grapplers in the recent past, and he dropped a bout to Antonio Silva due to his inability to shake "Bigfoot" from a dominant position.
Silva landed strike after strike on Emelianenko until the fight was stopped, and a rare loss was added to the "Last Emperor's" record.
Could Lesnar do the same?
I think so.
Once Lesnar establishes top position, he is incredibly difficult to handle, and I think Fedor would have even more problems with Brock here than he did with "Bigfoot" Silva.
Even though Brock is a powerful wrestler and almost always ends up in a dominant position on the ground in his fights, he rarely looks for the submission.
We saw a flash of an improving submission game in his bout against Shane Carwin, but since then it has been nonexistent.
Fedor, on the other hand, has an impressive plate of submission victories that cannot be denied.
With 16 of his 33 wins coming via submission, it is evident that Fedor has the tools to end a fight with his savvy arsenal of submissions.
That said, Lesnar held down Frank Mir, arguably the best heavyweight grappler in the world, at UFC 100 without ever being in serious danger.
It's a close one because of the great defense on Lesnar's part, but I still think in pure submission prowess, Fedor gets the edge.