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Ten women have tried; 10 women have failed. Ronda Rousey is, with very little doubt, the best female fighter on the planet.

All doubt would cease to exist entirely if not for, you know,her.

Ifshe didn't exist, Rousey's eight armbars and two TKO victories would be plenty of reason to permanently carve her name in the record books under "best ever."

No, I'm not talking about Cat Zingano. She's all but booked her New Year's weekend ticket to Las Vegas for her UFC 182 bout with the champion, but she may as well not pay for the extra carry-on now since she won't be bringing back 20 pounds of UFC gold with her.Zingano's had a knack for starting slow inside of the Octagon; Rousey's had a knack for starting fast. Like, "you've maybe got three minutes so show me what you've got" fast.

Then there's Holly Holm. Should she get past the sacrificial lamb at UFC 181 in December, she's bound to earn a title shot with the queen. But Rousey's not dumb; she'll have no part of Holm's strikes. And let's be real, if Rousey wants no part of the standup, she'll have no part of the standup. So, no, we're not talking about Holm here, either.

It also doesn't look like Gina Carano's ready to trade her silver-screen paychecks to start doing her own stunts in the UFC. Even if Dana White did manage to add enough zeros to Carano's big payday, there's no reason to assume she'd be competitive after a five- or six-year absence from fighting.

All right, let's be honest here, you probably already guessed that I was talking about Cris "Cyborg" Justino. Her invincible aura may have come undone after she dropped her first boutkickboxing or MMAin almost 10 years, but there's still a big portion of the MMA community that wants to see her step into the cage with the UFC superstar.

Cyborg once claimed that she was physically unable to make the cut to 135 pounds, meaning a bout with Rousey would only ever be able to take place outside of the bantamweight confines. But the champion took a firm stance, essentially forcing Cyborg to make the cut to 135 or lose hope of any potential fight for her crown.

"I really wanna fight Ronda," she said onThe MMA Hourin August 2012"I really want to. She says bad things about me. I never say bad things about my opponent. I want to do my best in the octagon, and if she says she wants to fight me, she can come to my weight or at 140."

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UFC: Will Ronda Rousey vs. Cris 'Cyborg' Finally Happen in 2015?