How I'd break it down:
Ash would probably win this fight. His double barrel shotgun would take care of the first two ragers, and he'd chainsaw the third.
But therein lies a problem.
Chainsaws are messy. Blood's really gonna fly, and as I mentioned before in this thread, Ash isn't exactly known for his defense. He's going to tear into this third rager full hog and he's going to get smothered in blood and grue in the process. And as we've seen many times in the Evil Dead series, that blood's going to get into his eyes and into his mouth.
My take: Ash may be the victor, but in no way is he the winner. This fight ends with Ash standing over the body of the final rager for a handful of seconds before he goes into spasms, the rage virus infecting his every cell.
