Yoshimitsu vs Lord Vader
If Superman and Goku are allowed on this forum then so is Yoshimitsu. Seeing that he has some sort of lightsaber thing and pretty good reflexes he would be a match to a burned out Sith Lord (There's no denying that by the time of Episode IV come's around Vader is past his prime).
I also found it interesting that he is partly machine as well. What do you guys think?