On March 6, 1985, a boxer named Mike Tyson made his professional debut in the heavyweight division. He was a ferocious puncher with a rare combination of both power and speed. In 1981 and 1982, he won gold at the junior Olympic games. His first fight against Hector Mercedes was one-sided, an ugly affair, really. Tyson made quick work of him in the first round, sending him to the canvass multiple times in the first 1:47 of the fight. In all, after less than a year in boxing, only three opponents made it past the first round.
In March 2011, roughly 26 years after Mike Tyson’s debut, a woman named Ronda Rousey had her first pro MMA bout. She was also a ferocious fighter, possessing skills unseen in women’s MMA. In 2008, Rousey won bronze in judo at the Olympic games in Beijing. Her first fight — if you want to call it that — lasted 25 seconds. In all, after her first 12 bouts, only one opponent made it past the first round.