Things quickly turned ugly for Jessie Rosas earlier today (Saturday, September 12, 2026) at UFC 4 night LIVE on Paramount+ from the Desert Diamond Arena in Glendale, Arizona as the brother of UFC fighter Raul Rosas Jr. suffered his first career loss at the hands of Sean King by massive knockout.
This fight was hard to predict on paper. While Rosas is the brother of a UFC fighter and has shown the ability to outwork his opponents inside the cage, King was a more polished fighter with a bigger frame and longer punches. Rosas finished as a fairly significant underdog, but some believed he could still beat King on short notice.
Unfortunately for Rosas, he never got a chance to materialize his offensive attack. After both fighters traded some kicks from distance early on, King was able to close the distance and wrap up Rosas. From there, King picked Rosas up and whipped him to the canvas as hard as he could. Rosas looked to be out right away, but King landed some solid punches to make sure.
Check out the video highlights below:
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