For me, it's still Povetkin. He was knocked down twice in the round prior and completely flipped the switch in devastating fashion.
Best Comeback KO: Povetkin (v Whyte) Best KO punch: Davis (v Santa Cruz) Best Action KO: Zepeda (v Baranchyk) All are nice, but they are not in the same category
Davis. Davis hit Santa Cruz with lighting. Povetkin only delivered a textbook punch. Davis's is definitely a cut ahead of Povetkin's ko, which was satisfying due to who he knocked out on a personal level.