King Bradley with two swords and eye patch off.
Zoro has 3 swords, and its after his 2 year time skip.
Healing factors work but with the disadvantages:
Zoro's disadvantage is he can't heal but his swordsmanship is WAY better than Bradley's.
Bradley can heal from decapitation and being killed for a good amount of times like the manga/anime.
This fight would only be Zoro dominating but i do not know because Bradley only has to land a killing blow because Zoro can't heal.
Location of the fight (empty city)