UFC Vegas 55 features, in the main fight, the decisive duel in the bantamweight division between Holly Holm and Ketlen Vieira. In the co-main fight, Michel Pereira faces Santiago Ponzinibbio.
The first Brazilian in action on the card, Felipe Cabocão faces young Chase Hooper to recover from the defeat he suffered against Chris Gutierrez in his last fight.
After an impressive debut in February, Jailton Malhadinho moves up to heavyweight to face Parker Porter.
On the main card of the event, Polyana Viana from Pará returns to the octagon after more than a year and is looking for her third consecutive victory in the organization.
Polyana's opponent will be compatriot Tabatha Ricci. 'Baby Shark' is trying for her second consecutive victory in Ultimate.
The co-main fight features showman Michel Pereira. Keeping an eye on the welterweight rankings, "Paraense Voador" is looking for his fifth consecutive victory.
To do this, Michel will have to go through Santiago Ponzinibbio. The "good Argentine" is coming off a defeat to Geoff Neal and wants to defend his place in the top 15 of the division.
The main fight of the night is Ketlen Vieira. Fifth placed in the bantamweight rankings, the Amazon native is looking to put another former champion on her resume, after defeating Miesha Tate in her last exhibition.
Ketlen's opponent will be Holly Holm. Second in the rankings, the American is fighting for another opportunity to regain the bantamweight belt.