Good fight, merger was tough as shit, Moorer was a great light heavy. I could either see moorer boxing him and winning UD, that's most likely. It's possible though that Mercer gets in and sodomizes him with a right hand
I lean towards Moorer by decision. Maybe Mercer comes from behind to score a stoppage, as he did after losing the first 3 rounds badly to Morrison, or that miracle left uppercut against Damiani, but I wouldn't count on it. Mercer could fight so poorly at times, I'm surprised he was able to fight on even terms with a 1996 version of Lennox.