I'm going to have to say Sanada for two reasons.
One is that Konomi may be saving the best/strongest character for the very last matchup.
The second is that when Nagoya's foreign players were first introduced, Yukimura had an amused reaction. It was almost indifferent, as if it didn't involve him. Sanada however made some sort of comment like "Crush them!"
Since Sanada had the more "involved" reaction, I'm thinking he'll be the one to directly face Nagoya, while Yukimura will spectate.
The only reason I see Yukimura playing singles one would be to show just enough of his ability to pique our curiousity.