Fairly or unfairly, perception is often reality.
Those perceptions can often be more harsh in boxing, considering the one-on-one nature of the sport. Just one or two weaker performances and suddenly the fans and media have gone from thinking you're a boxer on the way up to one who is overrated or perhaps washed up.
However the opposite can be true with an impressive knockout or a surprise victory over a boxer who was thought to be a heavy favorite.
One guy who would have made this list last year is Gennady Golovkin.
GGG knocked out all four of his opponents during 2013 and cemented his spot as a top TV draw on HBO and a top pound-for-pound fighter. In very short time, the former Olympian went from being a boxer few had heard of outside the hardcore fans to a prizefighter headlining major shows in big venues.
While GGG had arguably his best win to date in July 2014, the perception of his reputation hasn't changed, so he won't be on this year's list.