Round 1. The crowd is insane. They clinch. Loud GSP chants. Both men use knees from the clinch. GSP goes for the takedown. BJ defends. GSP keeps looking for the takedown, while BJ throws punches. They break. They trade punches, with GSP landing the best of the exchange. They go back to the clinch. GSP keeps going for the takedown but BJ blocks all attempts. Remember GSP was able to take down Matt Hughes and Josh Koscheck, champion wrestlers and bigger than BJ, constantly. GSP is using his jab to get the better of the standup exchanges. BJ looks a little frustrated. 10-9 St. Pierre.
Round 2. BJ lunges in and GSP counters with a punch. GSP is mixing up shots to the head and body. GSP again clinches, which draws some boos. BJ throws some punches to the side of the head and defends the takedown. But GSP gets it one minute into the round. BJ works the rubber guard. GSP lands a hard elbow. GSP postures up and drops bombs into BJ's guard. GSP gains side control and throws a series of punches to the head. BJ works back into butterfly guard, which gets a big cheer from his fans. GSP is now in the guard, but is throwing hard punches and elbows. GSP continues to punish BJ with punches and elbows. He gains side control momentarily but BJ reacquires guard. Loud GSP chants. GSP continues to hammer BJ at the end of the round. BJ is bloody but all things considered looks okay. 10-8 St. Pierre. This could be a long night for BJ Penn.
Round 3. GSP moves in with low kicks and a superman punch. He's mixing up punches high and low and looks a lot faster than BJ now. BJ is bleeding badly from the nose. GSP scores the takedown, again one minute into the round. BJ is using butterfly guard as GSP throws down punches. BJ hasn't been able to threaten from the bottom thus far. GSP with hard punches and hammerfists but BJ gets up and goes for a takedown of his own. GSP blocks and takes BJ back down. GSP continues to pound BJ as the round comes to an end. 10-9 St. Pierre, and that wasn't outside the realm of another 10-8 round, either. This is starting to become reminiscent of GSP vs. Jon Fitch.
Round 4. GSP picking BJ apart with punches and low kicks. GSP goes for a double leg and this time the takedown is easy. GSP is raining down elbows right here in front of the press. GSP has BJ's arms trapped just like Hughes/Penn II and is throwing unanswered punches but BJ is able to escape that position and secure half guard. GSP works back into side control and again starts throwing unanswered punches. Herb Dean looks to be considering stopping the fight, but BJ Penn as champion does deserve every benefit of the doubt. GSP looks to mount but BJ is able to stop that. A big cheer erupts from his fans, but GSP quickly works back into side control. GSP drops a very hard elbow and is pounding BJ into the mat with punches. GSP is looking to finish the fight and BJ is covering up. With just seconds remaining in the round GSP is pouring it on looking for the finish but he doesn't get it. 10-7 St. Pierre. What can you even say at this point?
The fight is called off. That's the right decision by the doctor. GSP wins in utterly dominant fashion, destroying BJ Penn like nobody else has ever even come close. He's at an incredible level right now to the point it's going to be hard to sell anyone as viable opposition outside of Anderson Silva, and at this point I would strongly favor GSP to win that fight.