If anyone knows the brute strength and wrestling abilities that Brock Lesnar brings to a mixed martial arts (MMA) fight, it's former heavyweight champion Frank Mir.

Having stepped into the Octagon opposite Lesnar twice before (UFC 81 and UFC 100), Mir has first-hand experience at just how hard it can be to get out from underneath the massive 265-pound monster. That's because Mir has found himself under the mountain of a man Lesnar in both contests.

And he's had mixed results.

In 2008 at UFC 81, the Brazilian jiu-jitsu black belt found himself on the bottom of the former WWE star as Lesnar rained down his 4XL-sized fists on Mir's head; however, Mir was able to capitalize on a split second concentration lapse from Lesnar to sink in a fight-ending knee bar that forced a tap.

At UFC 100 the following year, Mir once again found himself being suffocated by Lesnar as the former NCAA wrestling champion was able to take him down and followed up with some vicious ground-and-pound that forced the stoppage.

Mir tells "The MMA Insiders" on ESPN1100/98.9 FM (via Yahoo Sports), Alistair Overeem and his muscles will struggle with the wrestling abilities of Lesnar when they square off inside the Octagon this Friday (Dec. 30, 2011) in the UFC 141 main event.

Check it out:

"Brock doesn't shoot that low. He'll put his forehead in your chest, and he's going to run you through. If he's not able to take you down with that initial blast, he's going to run you against the cage. Then he's going to rip your legs out from under you. Now, you should have gotten taken down in the middle of the area, but instead, you've been taken down against the cage. Speaking from experience, that sucks. Now, you have a guy who is not a black belt in jiu-jitsu and who is not a wrestling All-American who is going to be able to get back to his feet, so what does he do? Are you going to try to tell me he's going to wrestle with a national champion wrestler for five minutes? His cardio is going to suck. I've seen guys with muscles like that, and that's why he slows down."

Saying Overeem doesn't have near the wrestling credentials that Lesnar possesses would be an understatement. He is, however, no slouch on the ground in submission department, registering 17 submission victories throughout his professional MMA career.

Preferring to strike, the former K-1 kickboxing champion will certainly look to avoid the takedown at all costs, but won't be in unchartered waters should the fight eventually get to the mat.

What's your take, do you agree with Mir's assessment that Overeem's muscles will do him more harm than good? And will Lesnar's wrestling be the deciding factor in the monstrous heavyweight clash this weekend?

Opinions, please.