#5 Ronda Rousey vs Natalya

We'll get another logical one out of the way. Natalya.
Again, friendships never last in wrestling - and this pair have had each other's backs from the start. Behind the scenes, Natalya had a hand in training Rousey - which may bode well when it comes to in-ring chemistry - but the story is there. Natalya can perform as an incredible heel and could easily play the "jealousy" card, both with Rousey's new found friendships and her success, notably the gold around her waist.
Female superstar says she inspired John Cena turning heel HERE
Natalya may be one of WWE's most underutilized talents and, while being one of the most technically sound women on the roster, would definitely be able to showcase Rowdy's emphatic, powerful style. This could be great.