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Carlos Ulberg made quick work of Tafon Nchukwi to close out the prelims of UFC on ESPN 38 in Las Vegas.      Related StoriesUFC on ESPN 38 video: Carlos Ulberg sparks Tafon Nchukwi, scores 75-second TKO - EnclosureUFC on ESPN 38 video: Mario Bautista turns in dominant performance, taps Brian Kelleher in first roundUFC on ESPN 38 video: Mario Bautista turns in dominant performance, taps Brian Kelleher in first round - Enclosure