(Today's) Ronda Rousey VS (UFC 1) Royce Gracie

[Pterodactyl]

You know, testicles actually help in fighting. She would give her the mousasi treatment

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Props to Rousey for working with somebody like Mousasi, but if this is a pretty good example of the gulf in size, strength, and skill between men and women in combat sports.
Mousasi is going at 5% or less in that video, and he is literally toying with Rousey. And he looks massive next to her. At any moment that he chooses, he could terminate Rousey. Mousasi is obviously a fantastic grappler, but he is far from an "Olympian".