LAS VEGAS >> Georges St-Pierre stated his case as the sport's pound-for-pound best with a TKO victory over B.J. Penn to retain his welterweight title in the main event of UFC 94 at the MGM Grand Garden Arena.
Referee Herb Dean stopped the fight between the fourth and fifth rounds on the doctor's advice.
St-Pierre improved to 18-2 while Penn dropped to 13-5-1. It's Penn's third straight loss at 170 pounds.