The UFC has already signed a number of high-profile names to its newly created women's bantamweight division—all possible threats to Rousey's reign. There are also some options from outside the promotion.
Check out these potential challengers to Rousey's UFC title.
One of the latest signees to the UFC's new women's division is the dangerous Cat Zingano.
Like Rousey, the former Invicta fighter also sports a perfect 7-0 record with three submissions and three knockouts. Set to face Miesha Tate at The Ultimate Fighter finale later this year, a win may get her a shot at the champ (h/t SB Nation).
Veteran Alexis Davis may be the most experienced addition to the UFC's new women's division.
Sporting a 13-5 record, the former Strikeforce and Invicta fighter has faced some of the biggest names in WMMA over her career, even owning wins over the likes of Julie Kedzie and Amanda Nunes.
Her hard-nosed fighting style could be a tough matchup for Rousey.
Another new face to the UFC is former Olympic wrestler Sara McMann.
Like Rousey, the former Invicta fighter has a world-class skill set and a perfect record.
This would be a great stylistic matchup of ex-Olympians.
I'm sure former Strikeforce champ Miesha Tate is dying for a rematch with Rousey following their bone-breaking first battle.
In her last outing, Tate used her rival's signature submission, armbarring Julie Kedzie last August.
Set to face Zingano later this year, a win is likely to get her that coveted rematch and the chance to take the title.
The biggest name in WMMA not in the UFC right now is former Strikeforce champ Cyborg Santos.
Recently requesting to cut ties with the promotion after refusing to face Rousey at 135 pounds, Cyborg will instead be facing Ediane Gomes at Invicta FC 5. The win will grant a rematch with former Strikeforce champ Marloes Coenen for Invicta's featherweight belt.
While that will be a great fight, personally, I'd rather see her take on Rousey in the Octagon.