LAS VEGAS –  Chris Leben ‘s struggles have been well documented, and the UFC middleweight isn’t shy about talking about those struggles. Leben has worked his way through substance abuse issues and a recent suspension after a positive drug test. With a new camp at Alliance MMA in San Diego and a fresh new attitude to go along with his sobriety, Leben believes he’s on point at just the right time. Leben (22-9 MMA, 12-8 UFC) on Saturday meets Andrew Craig (8-1 MMA, 2-1 UFC) as the featured fight on the preliminary card of UFC 162, which takes place at MGM Grand Garden Arena in Las Vegas. His boss, UFC President Dana White, has been a Leben supporter for years, ever since he came off Season 1 of “The Ultimate Fighter.” Leben returned in December after a yearlong suspension, but he dropped a unanimous decision to Derek Brunson at UFC 155. It was his second straight loss after a TKO against Mark Munoz at UFC 138 – after which he tested positive for oxycontin. White doesn’t share the opinion of some that Leben looked uninterested in fighting in December’s loss to Brunson