Didn't Goku beat Frieza 100% one on one? I think we can ignore pretty much anything that happened before he switched to full power. (and IIRC Gohan helping Goku only happened in anime).
Regardless of that, saying Goku is not that strong.................. do I really need to respond to that?
And even then, did any of the others beat a major enemy one on one?
And if we add anime only (cause I'm not sure exactly what happened in manga and anime), Goku beat several opponents in Other World Tournament, one on one.
And Nappa, though he was damaged from the others.