Iron Man vs Cap and Bucky. I love just about every fight scene in the poll but none can top this one only because we saw a Tony Stark that was angry and bloodlusted. He could have killed Cap more times that I could count and would've easily done the same if he were alone with Bucky.
While he lost the fight showed how dangerous he can actually be.
The Winter Soldier highway fight is tops. Everything was on point...the intensity, the choreography, the music. That scene made me a Cap fan as well as a Winter Soldier fan.