When the fight went down, it was a one-sided domination that saw GSP retain his title.
The fight saw some pivotal moments throughout, but it was a basic GSP fight. He outworked his foe for 25 minutes, utilizing takedowns and a jab that kept Diaz at bay.
GSP never gave Diaz space to get started. Diaz is known for his cardio, boxing and jiu-jitsu, but he could never get that going.
GSP never allowed it.
St. Pierre never had one outrageous moment that was really a highlight of the fight. He used his usual amazing takedowns throughout the fight and dominated from the top position to stifle the dangerous attack of Diaz.
I would say that the pivotal moment of the fight would be every time GSP planted Diaz on the mat. Whether it was a double leg or a takedown from a waistlock, GSP took Diaz down on demand.
More than that, GSP used a solid jab to detriment Diaz. Diaz tried to get his boxing going, but GSP kept him at bay and prevented any dangerous onslaught that could have been had.
The best offense Diaz had was swinging at GSP when the buzzer sounded. On multiple occasions, he tried to keep fighting after the round was over.
However, that should not overshadow the fact that GSP's pivotal moments consisted of him dragging Diaz to the ground and dominating. His ground-and-pound was solid, as he consistently rained down blows on his opponent.
It was a classic performance that solidified GSP's claim as one of the greatest ever. It was a fight that he wanted, had emotional investment in and dominated in to keep him the champion.