Eight years ago, David Mitchell watched Chuck Liddell win the UFC light heavyweight title by knocking out Randy Couture at Las Vegas’ MGM Grand Garden Arena. Right there, he resolved not to return to the city until he was fighting in the octagon. “Seven-and-a-half years later, that dream comes true,” Mitchell told MMAjunkie.com Radio (www.mmajunkie.com/radio). “Regardless of what happens, I feel like I’ve already made it.” On Saturday, Mitchell will fight for the first time in Sin City in what is his fourth UFC appearance. It also could be the last time he steps into a cage at all. On his road to the octagon, he’s suffered nerve damage in his spine that once left the left side of his body with a fraction of its usual strength. So Mitchell (12-2 MMA, 1-2 UFC), whose nickname is “Daudi,” feels he’s got little to lose when he walks into the MGM Grand Garden Arena to fight Mike Pierce (16-5 MMA, 8-3 UFC) at UFC 162 in the event’s Facebook-streamed curtain-jerker. “This might be my last fight,” he said.