#2. Ronda Rousey vs. Julianna Peña
Julianna Peña was not a fighter on too many fans' radars when Ronda Rousey was last in the UFC. However, she has since climbed to the top of the sport and will be one of the top contenders to secure the Rousey fight should she return to MMA.
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Peña defeated Amanda Nunes in shocking fashion to win the bantamweight title last year. Given how popular Rousey remains, she could easily challenge for the belt immediately upon her return to competition. That would then set up a bout between this pair.
On top of that, the fight would be a lot of fun. Peña has proven herself to be a highly entertaining fighter that would be sure to do a great job of selling this bout in the build-up. If the UFC opts for a fresh match-up with Rousey, this definitely seems like the best route to go in.
#1. Ronda Rousey vs. Amanda Nunes II
Regardless of her accomplishments, Amanda Nunes will go down in history at the woman who retired Ronda Rousey from the sport of MMA. The first fight between these two was very one-sided and saw Nunes win via a quick first-round TKO. It would therefore make sense that if Rousey returns to the UFC, she might come back for revenge.
The UFC might have some concerns about booking this fight given how dominant Nunes has proved to be since her first fight against Rousey. However, 'The Lioness' has now lost her belt, and should she suffer a second straight defeat in her next fight, fans might start to believe in Rousey's chances.
The fight would be huge for women's MMA and provide Rousey with the opportunity to prove she is still elite. The bout could be for the bantamweight title, but it would still be huge without a belt being involved. With a win, Rousey would re-enter the discussion for the best female fighter ever.