Shane del Rosario kept his undefeated record intact, as he submitted Lavar Johnson with a first-round armbar in their heavyweight grand prix reserve bout. The end came 4 minutes, 31 seconds into Round 1.

Del Rosario survived a first-minute takedown and some heavy blows from Johnson, who entered the cage on a seven-fight winning streak. The Laguna Niguel, Calif., native scored with a takedown into side control, moved to mount and went to work with his ground-and-pound. Johnson could not shake the position and absorbed a series of unanswered blows from the top. With his wilting opponent's arm there for the taking, Del Rosario cinched the armbar and coaxed a quick tapout.

"I knew he would come out pressuring me," said Del Rosario, who improved to 3-0 under the Strikeforce banner. "It's my first fight in seven months, so it was a little tougher than I thought it would be. He hit me with some good shots. He took me down, but I kept my composure and [took] the armbar."