Julianna Pena becomes the first-ever women's Ultimate Fighter champion

There was no derailing Julianna Pena from continuing her improbable run to win The Ultimate Fighter as she became the first ever women's champion from the show while knocking off Team Rousey's Jessica Rakoczy in the first round.

Pena may have been painted as public enemy No. 1 on the reality show, but her business inside the Octagon was flawless through all of her fights and it continued when she fought in the finale as well.

Heading into the fight, the clash of styles came down to a test of wills of whether or not Julianna Pena could get the fight to the ground or Rakoczy, a former boxing champion, would be able to keep the bout standing where she would have her biggest advantage.

The answer came in rapid fire fashion with Pena landing two takedowns in the opening moments of the fight.

Pena's second trip takedown put Rakoczy on her back, and she would never get up again. Pena's pressure was absolutely unrelenting as she peppered away with heavy punches, and no matter how hard Rakoczy tried to push away, the attack was just overwhelming. Pena's offensive onslaught eventually landed her in mount where she rained down fists and elbows, looking to put Rakoczy away.

Rakoczy's only defense was to kick up her legs and try to shift Pena off while valiantly covering up both sides of her head to weather the storm of shots her opponent was unloading. With just seconds remaining in the fight, Rakoczy twisted and turned to try and get away, but Pena wasn't about to slow down and that's when referee Mario Yamasaki saw enough and stopped the fight.

Pena's finish came at 4:59 in the first round and while Rakoczy bounced right up without showing any serious damage from the punishment she endured, there was no doubt who the winner was on Saturday night in the first ever women's Ultimate Fighter final.

"Jessica's a very tough girl, she hung in there, I can't believe I got the finish with one second left," Pena said. "I can't wait to put in more work. It's just about to get started."

Pena was an underdog heading into the show and despite being picked No. 1 by friend and training partner Miesha Tate, she was targeted for elimination early on by opposing coach Ronda Rousey. Pena would not be deterred, however, as she finished veteran Shayna Baszler and Sarah Moras on her way to the finals.

With another flawless performance in the finale, Pena (5-2) now becomes the inaugural female Ultimate Fighter champion and without a doubt could be a force in the UFC's bantamweight women's division on day one in the Octagon.

The win also means a clean sweep for Team Tate in the finals as Pena joins Chris Holdsworth, who also won on Saturday night with a submission victory over Davey Grant.