Dude, telekinesis. That is all Ermac needs to keep Wolverine away, then he'd just slam his body into the ground until Logan goes unconscious. Ermac wins if he plays it smart with TK.
Ermac wins effortlessly.
Ermac could use his TK to literally rip the flesh off of Wolverine's bones. He wins.
Seems to be a clear cut win for Ermac lol