New opponent, no problem for Stefan Struve.
Johnson came out quickly with a barrage of power strikes that sent Struve backpedaling against the fence, but Struve covered up, pulled guard and quickly pivoted for the fight-ending arm bar.
"I felt his control and I knew I could get the arm bar if I jumped guard," he said.
Struve said he knew his best chance to win was to get the fight to the ground, and he was proven right.
"He's a heavy hitter so why give him any chance at all to win the fight," Struve said of his strategy.
It was Struve's third straight win, improving to 24-5.
Johnson fell to 17-6.