null: One of the most ferocious punchers in the UFC's heavyweight division, Derrick Lewis returns to the Octagon having earned his last eight victories by knockout, a stretch that includes UFC finishes of Jack May and Guto Inocente. It's a scary run for the Texan, but South Africa's Ruan Potts believes that he has what it takes to stop it. A fighting pioneer in his nation, Potts has come up short thus far in his UFC career, but with a solid ground game and fight-stopping power, he's determined to make sure that he ends the bout as the last man standing.