Gennady Golovkin heads into his title defense against Daniel Geale this weekend riding a knockout streak of 16 straight. Even though he only fights at 160 pounds, "GGG" has to be viewed as one of the biggest punchers in the sport.
Still, overall this list is dominated by the heavyweights. Given the economics of the sport, most hard-punching fighters who weigh close to 200 pounds will chase the big bucks fighting the big boys.
The knockout is the boxing equivalent of the home run. And the fighters who can collect them have a fast track to stardom.