Julianna Pena made her professional MMA debut in May 2009, and she won her first four consecutive bouts. Pena took part in The Ultimate Fighter: Team Rousey vs. Team Tate, going on to defeat Jessica Rakoczy to win the tournament, the first women’s edition of the tournament in the UFC’s history.
Pena holds victories over Jessica Eye and Cat Zingano. She most recently competed against Valentina Shevchenko in January 2017, headlining a UFC on Fox event.