Normalized for speed and strength, making this only about boxing skill, the list above me is a decent one (minus Cage). Unfortunately, the true answer might just be the most skilled MAers. True, it's not boxing-specific with most of them. But comics are their own beast; the general skill levels shown by dozens of martial artists means that they'd transition well to pretty much any style, boxing included. So Karate Kid is a good default answer. And #'s 2-5 might just be similarly haxx MAers.
Originally posted by Endless Mike
Ben Grimm is being underestimated...
Originally posted by Deadline
^ I was gonna say.
Anyhow, Wildcat is hands down the best boxer in either Company.
Other notables are Ben Grimm and Daredevil. Interested if anyone can come up with 2 more names i'd agree with to round out the whole 5.