LAS VEGAS – Tony Sims seemed to be in total control of almost the entire first round of his fight with Abel Trujillo . But after one unnecessary takedown attempt led Sims (12-4 MMA, 1-2 UFC) to expose his neck, Trujillo (13-7 MMA, 4-3 UFC) wasted no time slapping on a guillotine choke to force the submission at the 3:18 mark of Round 1. The lightweight bout opened up the main card of today’s UFC 195 event at MGM Grand Garden Arena in Las Vegas.