I've been thinking about this one for a minute and I am pretty confident in picking Mancini. He was a bull at 135 more accomplished at the weight. It would be a good fight for the fans but Mancini would impose himself, come on strong in the 2nd half and win clearly. A 15 round fight favors Mancini more than a 12.
Lopez was one of my favorites but at Lightweight I gotta go Mancini by decision. Tony would do better than his mentor Bobby Chacon though. He had more left at 35 than Bobby. who had no business at Lightweight.