THE STORY
On January 31, 2009, at UFC 94 in Las Vegas, Nevada, BJ Penn faced Georges St-Pierre in a welterweight title bout. During the fourth round, Penn delivered an illegal knee to St-Pierre's head while St-Pierre was on the ground. The referee halted the fight, and St-Pierre was awarded a technical knockout victory due to the illegal strike.
TEAMS / PEOPLE:
BJ Penn, Georges St-Pierre
WHY IT MATTERS
This incident is notable as it led to a controversial stoppage in a high-profile championship fight, highlighting the importance of adhering to the sport's rules to ensure fair competition.