Cris Cyborg: Ronda Rousey talks about submitting Cain Velasquez, but won't even move up to fight me at featherweight

Ultimate Fighting Championship (UFC) Women's Bantamweight Champion Ronda Rousey has blown through the 135-pound ranks of both UFC and Strikeforce with relative ease, thanks to an unparalleled grappling game which was good enough to earn her a bronze medal at the 2008 Summer Olympics.

Beware of the armbar.

The UFC 168 co-headliner -- who is also doing work as head coach opposite Miesha Tate on season 18 of The Ultimate Fighter (TUF) -- is so confident in her abilities, she believes there is a chance she could submit UFC Heavyweight Champion Cain Velasquez, should they ever find themselves "under the right circumstances."

That didn't sit well with former Strikeforce Featherweight Champion Cris Cyborg (via Facebook):

It's amazing to me that Rhonda is talking about her beating Cain. Who's a heavyweight man. But she won't go to a weight where she has fought other fights at. And challenge the best female fighter in the world. Not being cocky. But I believe that this Being one athlete at the top And many agree. Yet she will put cains name in her mouth,and not mine. She is a actress after all. Talking about a fantasy fight. When there's a super fight right in front of her. Yet she talks about fantasy.

Unfortunately, Cyborg is stuck in limbo.

Both ladies are clearly head and shoulders above the rest of their competition, but compete for different promotions. There was a chance to get the Brazilian into the Octagon earlier this year; however, that deal fell apart when the two sides started talking turkey.

That's before they even got into the discrepancy in weight. In short, "Rowdy" doesn't want to go up and Cyborg refuses to come down.

Until one of them yields -- or at least agrees on a 140-pound catchweight bout -- mixed martial arts (MMA) fans will be forced to speculate as to who is the world's top female fighter.

Your pick?