Dominick Cruz-Jimmie Rivera, Cynthia Calvillo-Carla Esparza on tap for UFC 219 in Las Vegas

Two former champions are set to return to the octagon at UFC 219, which marks the organization’s final event of the year.

Former UFC bantamweight titleholder Dominick Cruz (22-2 MMA, 5-1 UFC) will see action for the first time since losing the title to Cody Garbrandt, when he takes on the 20-fight winning streak of Jimmie Rivera (21-1 MMA, 5-0 UFC). Also, former strawweight champ Carla Esparza (12-4 MMA, 3-2 UFC) is set to clash with rising star Cynthia Calvillo (6-0 MMA, 3-0 UFC).

The UFC made the fights official today.

UFC 219 takes place Dec. 30 at T-Mobile Arena in Las Vegas. The main card airs on pay-per-view following prelims on FS1 and UFC Fight Pass.

Cruz, No. 2 in the latest USA TODAY Sports/MMAjunkie MMA bantamweight rankings, dropped the 135-pound belt to Garbrandt at UFC 207 last December. Cruz opted to take time off since and was originally angling for a fight against the winner of November’s title fight between Garbrandt and T.J. Dillashaw.Cruz will have to get a win under his belt first, though.

Beating No. 5 Rivera has proven to be no easy task, however. After losing his second MMA fight in November 2008, Rivera has rattled off 20 consecutive wins, including five in the UFC. He’s coming off a unanimous decision over Thomas Almeida at UFC on FOX 25 in July.

No. 5-ranked Esparza, meanwhile, has been up and down down since losing her title to Joanna Jedrzejczyk at UFC 185 in March 2015. She won her most recent bout, though, using a takedown-heavy game plan to top Maryna Moroz by unanimous decision at UFC Fight Night 112 in June.

Esparza will attempt to avoid becoming a signature win for No. 12-ranked Calvillo, who has been on a tear since making her UFC debut on short notice at UFC 209 in March. Calvillo has gone 3-0 inside the octagon in short order and will attempt to become the first and only UFC fighter with four victories in 2017.

Also set for UFC 219, per the Las Vegas Review Journal, is a flyweight contest between Louis Smolka (11-4 MMA, 5-4 UFC) and Matheus Nicolau (12-1-1 MMA, 2-0 UFC).

The UFC 219 currently includes:

• Dominick Cruz vs. Jimmie Rivera
• Cynthia Calvillo vs. Carla Esparza
• Matheus Nicolau vs. Louis Smolka

For more on UFC 219, check out the UFC Rumors section of the site.