UFC 331 video: Casey O'Neill pulls off incredibly slick armbar - MMA Junkie

Casey O'Neill pulled off one of the slickest finishes of the year on the prelims of UFC 331.

Things weren't going Oneill's way until they all came together in one huge finishing moment at 3:22 of Round 1, as she locked in an armbar on Eduarda Moura. The women's flyweight bout took place at Crypto.com Arena in Los Angeles.

O'Neill (12-2 MMA, 7-2 UFC) was in trouble from the first exchange after Moura (12-3 MMA, 3-3 UFC) secured an early takedown. Moura immediately went to work on the ground, looking for ground-and-pound and submission attempts. O'Neill was in danger from an anaconda choke, but remained calm and worked her way out of it, and even found herself in some awkward positions on the bottom.

Then, out of nowhere, O'Neill managed to get both feet on Moura's hips, elevate her in the air, and lock in an armbar on the way down. It was an incredibly slick helicopter armbar sequence that forced Moura to immediately tap.

During her post-fight interview, O'Neill said she worked on it in the gym at times, but getting it done in a real fight was "awesome." O'Neill also used her time on the mic to call out Maycee Barber.

O'Neill extends her winning streak to three, which includes wins over Luana Santos and Gabriella Fernandes. Moura leaves with her third career loss and back-to-back defeats, as she entered on a loss to upcoming title challenger Wang Cong.