I'm rewatching the third season of Young Justice, and the episode I was watching, episode 7, sort of serves as Vandal Savage's backstory. There are some really interesting stuff that they contact to him, like how Nabu is Savage's son, and that he's been secretly protecting Earth even though he's viewed as a villain...

Anyway, my question is, with all that experience that Savage has, who are some top tier fighters that Savage can defeat?

Can he defeat Batman, Ra's al Ghul, O-Sensei, etc?