We spar hard rounds, we beat the s–t out of each other,” firefighter Nicole Malpeso, 32, said of her training regimen.

Mark Brown/Getty Images Women's boxing is divided between 17 weight classes ... holds each of the titles and secondary belts. For a list of the best fighters regardless of weight class, check ...

British boxer Tyson Fury ... there have been other women athletes who would have cracked the list in the past. Business magazine Forbes said Japan’s four-times Grand Slam tennis champion ...