Nick Diaz has been calling out Georges St. Pierre for a long time. Following a victory in late 2011, Diaz yelled out, "Where you at, George? Where you at, motherf-----?" On March 16, 2013, Diaz finally fought St. Pierre for the UFC Welterweight Championship in St. Pierre’s hometown, Montreal, Quebec, Canada.
In the first round of the fight, GSP wasted no time taking down Diaz. GSP tried to punish Nick Diaz with strikes, but Diaz did a good job avoiding damage. Diaz managed to use the cage to stand, but GSP dragged him back to the ground. Diaz tried to stand again, only to be slammed back to the ground. After the round ended, Diaz had to be restrained by the referee.
In the second round, GSP was again able to take Diaz down. The round ended with St. Pierre and Diaz striking but not doing any significant damage. Diaz again had to be held back by the referee.
In the third round, Diaz landed a hard body shot and was able to stop a takedown attempt from GSP. Diaz also hurt GSP with a flurry of punches, but GSP was able to recover. GSP took Diaz down at the end of the round. When the round ended, Diaz took a swipe at GSP, drawing a warning from the referee.
In the fourth round, Diaz had his moments with his striking and his takedown defense, but GSP was again able to take Diaz down. The round ended with GSP controlling Diaz.
The fifth round included some clinching, but GSP again controlled Diaz on the ground. At the end of the round, Diaz raised GSP's arm, and the fighters embraced. All three judges scored the fight 50-45 in favor of GSP.
In the post-fight interview, GSP praised Diaz's fighting skills.
GSP said, "I didn't want to fight in boxing range with [Diaz] because he's the best boxer in MMA."
After the fight, Diaz hinted at retirement.
Diaz said, “I think I’m going to have to figure out whether I want to keep doing this. To be honest, I really don’t think I’ve got anymore."
In the post-fight conference, however, Diaz seemed to change his mind. He said that he would like a rematch with St. Pierre but doubted it would happen.
Diaz said, "I doubt he'll give me one. I don't think he wants to fight me again."