The fight takes place in an abandoned warehouse. Baron Zemo is inside and Deathstroke comes in. Who wins?
Baron Zemo sucks now. He just lost to Sharon Carter, I don't know if that's bad writing or not.
But if you give him prep and access to all his gear he could maybe beat Dathstroke a few rounds but Deathstroke will probably still take a majority... that's pretty much the only way he beats people is with prep.