Rousey's undefeated run in the UFC has impressed even the toughest critics. She's been compared to Mike Tyson in his prime and is generally considered one of the best pound-4-pound fighters on the planet.
In her two fights that were within the ESPY calendar year, Rousey disposed of two top contenders in rival Miesha Tate and Sara McMann.
Tate gave Rousey her toughest test to date on Dec. 28 last year, but the champ was able to apply her devastating armbar in the third round to secure the title defense. Against McMann in February, Rousey connected with a big knee to the body to crumble McMann in the very first round.
Rousey is fresh off arguably her most dominant performance yet, when she beat Alexis Davis at UFC 175, recording the second-fastest finish ever in a championship fight with the 16-second TKO.