The UFC Hall of Famer was victorious Friday night in the main event of Wargods-Ken Shamrock Productions' "Valentine's Eve Massacre" at the Selland Arena in Fresno, California.
Shamrock dropped his opponent Ross "Grizzly" Clifton with a right punch, took side control and finished with an armbar. Shamrock's last submission victory took place in August 2001.
The first-round win for Shamrock sets him up for a possible old school superfight with Tank Abbott, who also walked away at the event with a much needed win.
Abbott clinched with Mike Rourke and scored the first-round knockout with a punch to the back of the head. The referee allowed it and Abbott recorded his first win in almost four years.
Shamrock and Abbott combined for 15 losses out of their last 17 fights coming into the event.
Shamrock, who has been open with his desire to promote Shamrock-Abbott on pay-per-view as the main event for the next Wargods-KSP event, called out Abbott after the fight.