Rowdy Ronda Rousey thinks she's the baddest woman on planet Earth.

After all, the Olympic bronze medalist and UFC Women's Bantamweight Champion has yet to be defeated in amateur and professional bouts. Olympic silver medalist and undefeated challenger Sara McMann was supposed to be Rousey's toughest fight to date. Yet a knee to Sarah McMann's midsection proved to be the difference maker as referee Herb Dean stopped the fight shortly thereafter. In all the title fight lasted just 66 seconds and the sold-out Vegas crowd was not happy.

Rousey is best known for her signature move: the armbar. Coined the armbar assassin, she can practically rip off a fellow fighter's arm. But for the first time in her pro (or brief amateur) career, she elected to finish off her opponent in a standing position. She talked about the fight with Yahoo Sports.

"I promised my coach this time that I was going to drop her with a body shot," Rousey exclaimed. "I called it. We've been training it a lot and it's just a goal that I had. I don't like calling it or saying it to anyone else, like the media, because I like to keep my mind open to whatever's there. But to my coach, I promised him I was really going to try."

Dean said he had to stop the fight, because frankly the knee looked devastating.

"If she doesn't make a move to protect herself, how long do I wait until I stop it?" Dean recalled. "I don't know how big of a knee it was, because I didn't take it, but she was just holding her midsection and after a while, I had to stop it."

McMann thought the fight was stopped prematurely. 

"Things were slowed down in my head," McMann remarked. "I felt it connect and my body just moved to protect itself. I heard [Dean's] voice and I immediately tried to get back up. I'm not going to blame the referee for something I feel I should be able to control."

Who will be Rousey's next fighter? Could a Cris Cyborg super fight be in the works? The Invicta FC fighter is said to be the only woman capable of pounding Rousey into submission... Cyborg has abused steroids before, but has been clean for a while now. Her results have stayed the same: female fighters strewn across the octagon. And most importantly she has finally decided to cut weight and meet Rousey at 135 pounds.

Can Rousey win that fight?

Do you believe that "Rowdy" Ronda Rousey eclipses both light heavyweight champ Jon "Bones "Jones and legendary middleweight Anderson "The Spider" Silva in marketability? Let us know in the comments section below.