UFC Vegas 121: Raoni Barcelos stretchered out, hospitalized after scary fifth-round KO by Raul Rosas Jr. - Yahoo Sports

Raul Rosas Jr. emerged from UFC Vegas 121 with the biggest win of his career. We're still not quite sure what happened.

The 21-year-old rising star defeated Raoni Barcelos in his first career main event, getting a needed knockout in the fifth round. It's unclear how exactly he got the stoppage, as Barcelos, 39, appeared to lose consciousness either as he was taken down or after.

Barcelos had to be carried out of the Octagon on a stretcher, a surreal and frightening ending to what had been shaping up to be a Fight of the Year contender. He did not appear to be moving on the stretcher.

"I want everybody tonight to please pray for Raoni Barcelos. He's a warrior," Rosas said in his post-fight interview.

The UFC later reported that both fighters were being taken to the hospital for head and neck scans.