A cliche answer at this point, but most likely what would have happened. Yamanaka was a bad dude, but his chin got cracked on several occasions.
Who wins? ...Japanese national morale, because they would have played host to a FOTD. (but Monster would win, by stoppage, in a war)
As everyone said, most likely my KO by Inoue. Love Yamanaka though as was a man awesome fighter. Maybe Inoue vs Hasegawa would’ve been more competitive imo
Yamanaka, like Hasegawa before him, never really got his props during his reign. But that's what you can expect when you pick up a belt and just defend against mandatories for a few years. One thing though, Yamanaka had very bullish strength. He was incredibly strong. If he could assert his jab early and make Inoue go onto his back foot he'd be in with a shot. But more than likely Inoue smashes him. Inoue is better than a roided to the gills Nery.