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Watch Khalil Rountree score a vicious TKO win over Karl Roberson at Saturday's UFC Fight Night 203.      Related StoriesUFC Fight Night 203 video: Khalil Rountree takes out Karl Roberson with ruthless flurry - EnclosureUFC Fight Night 203 video: Drew Dober derails Terrance McKinney with wild comeback TKOUFC Fight Night 203 video: Drew Dober derails Terrance McKinney with wild comeback TKO - Enclosure