You guys are missing the big picture here. The Ultimate Fighting Championship has been fighting to be legitimized for at least a decade and a half. MMA is still illegal in New York, or should I say it isn't sanctioned. Mr. white and the Fertita brothers wouldn't allow such a freak show to take place. It would only taint the legacy they are trying to achieve. Right now UFC has a monopoly on MMA. I won't even mention Bellator,there's no point.
Now comparing tennis, curling, figure skating, etc. I don't know and I don't care. This is combat sports. Rhonda wouldn't have much of a problem dealing with many of the UFC fighters in a lower weight class. She is an Olympic caliber competitor. Now finding a man below her weight class would prove more of a challenge.