Technically the Tezuka-Yukimura match happened in pre-canon, but you never see it. It's mentioned in Genius 353, but you only see Sanada's reaction to it. However, you know that they are on par with one another. That's not enough for me, though. I want to know who won or who would win.
(I originally posted this at
http://fulminata.dreamwidth.org/284283.html.)