#3 Brock Lesnar (c) vs Frank Mir (ic) - UFC 100
Another heavyweight war involving Lesnar. This was perhaps Brock Lesnar's most prominent win in his MMA career. His first fight in the UFC happened to be in UFC 81 against Frank Mir. Mir would defeat Lesnar by submission, giving him a cold welcome to the UFC.
Lesnar had his chance at revenge at UFC 100. By this point, he was already Heavyweight Champion of the world, and due to injuries and inactivity, Frank Mir won the interim championship meanwhile.
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In arguably the most stacked card in UFC history (up to that point), Lesnar headlined the historic event and would end up getting his revenge on Mir, finishing him in the second round of their fight. Lesnar was far from humble after the fight, drawing the ire of the crowd. Either way, he proved that he was the real deal in MMA that night, and would have one more title defense.