Pena takes on Amanda Nunes in a rematch to retain her IBF women's bantamweight belt.
The main event of UFC 277 on Saturday will be a repeat of their title bout.
Pena surprised the world late last year by submitting Nunes in the second round of their UFC 269 fight.
During Wednesday's media day for UFC 277, Pena said, "At the end of the day, Amanda and I are the finest fighters in the world." Pena is confident in her abilities, but she refuses to look beyond this weekend.
The torch has been passed.