#3 Cris Cyborg vs Ronda Rousey

Probably the two most famous women in the history of MMA. Cris Cyborg, the reigning Featherweight Champion and Ronda Rousey, the former Bantamweight Champion, could yet still have their dream match.
Why didn't it happen?
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Rousey's final UFC fight occurred at UFC 207 in December 2016. Cyborg debuted at UFC 198, during Rousey's one year sabbatical from the sport. After Rousey's knockout loss at UFC 207, she never fought again.
If the match were to occur then one of these two ladies would either have to cut or put on weight to clash inside the Octagon.
Who would have won?
This is an extremely difficult one to predict. Both possess devastating striking power. However, Rousey has the far superior grappling ability and Cyborg's only MMA defeat came via submission, which is what Rousey's likely route to victory would be.