That's a tough one. I would like to say Cap vs Iron Man, but that one had WS in the middle, so I don't know if it counts. But if it did it might just be that one.
EDIT: just read the comments and... I change my mind... Cap vs Winter Soldier is my fave.
Torn between when Wanda shows up and just owns Thanos in his prime or that cool fight between Cap & Batroc in the Winter Soldier. It's short and neatly choreographed... I don't know why, I've just always liked it - especially that finishing move.
