But realistically there are alot of guys that could beat up Ronda Rousy without doing MMA. There are just things a female body would not be able to over come. No matter how hard she trains she cant grow a penis. Unless your Cyborg and you drink Steroid Shakes after every workout and before bed. Rumor is she doesnt even have periods anymore.
A big 180-200 pound dude who is in shape could beat up Ronda on physical traits alone. Its unlikely she will be bobbying and weaving the punches if in a street fight and its impossible she will over power him.
If we are talking about a boxing match or letting loose on a boxing bag then thats different and id give Ronda the nudge.
she would have a definite speed advantage against a 180-200lber and you should know it's very easy to slip peoples punches if they don't actually have any training. Punches are super telegraphed and she would probably duck a punch and take anyone without a wrestling base down with ease. Judo is suited well for a smaller opponent to defeat a larger, stronger opponent with technique and use of their momentum and your leverage, if they aren't KOed from the throw then they will be armbarred instantly.