B-level grapplers like MacKenzie Dern would maul her ass.
HW like Gabi Garcia would paralyze her for life.
Anyone who could beat her at ADCC would beat her in MMA as well; Rousey's primarily a grappler, if you can beat her grappling you can beat her in MMA.
I don't know who Dern is, but if she can maul Rousey's ass in ADCC she should make her way into MMA and earn millions.
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