Stephen “Wonderboy” Thompson ended his announced UFC career with a spinning back-kick knockout of Charles Radtke at UFC 334 in New York. The finish came at 2:54 of the third round, giving Thompson a victory in what he had said would be his retirement fight.

The bout took place at Madison Square Garden on November 14, 2026, and closed the event’s preliminary card. After the knockout, Thompson laid his gloves down in the Octagon.

Thompson worked his way into the fight

Radtke pressed forward from the opening bell and went for a takedown before the first minute had passed. Thompson worked back to his feet, but Radtke kept him in a clinch against the cage. Once Thompson broke free, he began using his jab to keep Radtke at range and counter from the outside.

Radtke continued to push in the second round and tried again to take Thompson down, but Thompson resisted. He answered with straight punches and a variety of kicks, steadily building his offence from a distance as Radtke struggled to respond.

Thompson came out for the third round with another heel kick to the face. He kept throwing combinations as Radtke’s pace slowed, then landed the spinning back kick that sent his opponent to the canvas and ended the fight.

A final fight after nearly 15 years with the UFC

Thompson said after the win that he had been with the UFC for almost 15 years and could not have asked for a better ending. His decision to make this his final fight had been announced before the bout.

A RotoWire preview published before the event noted that Thompson had lost five of his previous six fights. He finished his UFC career with a win over Radtke, capped by the knockout that closed the prelims.