Watch: Sean King III lands brutal slam KO at Noche UFC

GLENDALE, ARIZONA - SEPTEMBER 12: Sean King III reacts after his knockout victory over Jessie Rosas in their featherweight fight during the Noche UFC event at Desert Diamond Arena on September 12, 2026 in Glendale, Arizona.

Jeff Bottari / UFC / Getty

Sean King III had a UFC debut to remember, slamming Jessie Rosas into the mat and scoring a devastating knockout win just 36 seconds into their featherweight bout at Noche UFC on Saturday in Glendale, Arizona.

King followed up with a few punches on the ground before the referee stepped in.

For U.S. viewers:

SEAN KING III WITH AN UNREAL SLAM AND KO 😳

📺 @paramountplus pic.twitter.com/czaUMJAzOd
— UFC on Paramount+ (@UFConParamount) September 12, 2026

For Canadian viewers:

SLAM KO 😱 #NocheUFC

Sean King III improves to 7-0 after the 1st RD finish! pic.twitter.com/zm8VwgHzFC
— UFC Canada (@UFC_CA) September 12, 2026

King, a 22-year-old fighting out of Louisiana, improved his professional record to 7-0. He's 4-0 this year after winning three straight fights under the Fury FC banner between February and July.

Rosas, the 23-year-old older brother of UFC bantamweight Raul Rosas Jr., was also making his Octagon debut. He fell to 8-2 as a pro.