Deveaux jumped Barch and then got his ass kicked and begged for the linesmen to jump in and save him, not to mention the fact that Deveaux has a big size advantage on Barch which is obvious when they fought. Anyone who said Deveaux won this fight is an idiot.
I think Barch had a very slight edge, mostly though I think it was just a matter of Deveaux calling it right after throwing a couple cheap blows near the end that makes me want to give it to Barch. I also didn't much care for the other Leaf (Kubina) trying to trip or lightly check Barch at the very beginning of the fight, pretty unsportsmanlike if you ask me =P
Slight edge deveaux for landing the best shots of the fight, if you go to drop your gloves.com there is a great action photo of deveaux landing the big right near the end of the fight, deveaux takes the two fights in this game.