Before he left the building, though, Stockton's favorite son decided he wanted a rematch.
Diaz was a late arrival for the post-fight press conference in Montreal, but before he got there, he took the time to talk to MMAFighting.com's Ariel Helwani on Fuel TV before he called it a night. And in doing so, he dropped one last classic Diaz interview performance.
"I'm trying to retire, I'm trying to get out of this gig, but I would love a rematch," Diaz said. "I think I could beat you. I really do, I think I could beat [St-Pierre]. I think I could stop the takedowns for the first two rounds and get to fight my whole fight and I think I could beat you."
Diaz went on to disparage St-Pierre's fighting style. "I'm not hurt," Diaz said. "Getting hit, you know, he hits like a woman. He has his full-on range to separate and punch me, but he hits like a girl because he's too scared to let go to get a real punch in."
In his roundabout way, Diaz said that he doesn't want to take a fight against an up-and-comer in the division, but would rather wait and see what happens between GSP and Johny Hendricks and then proceed from there.
"You can say, I don't want to retire if I get a rematch, but, if I don't get a rematch, who am I going to fight?" Diaz asked. "I'm not going to fight any of these guys out there. They came in after me. ... Everyone who started from my generation, all these new kids, I don't want to get in there and jump around with these new kids."
"I don't think Georges wants to fight Anderson Silva, I don't really think he does," Diaz continued. "So, if they don't, if they're going to make that Johny Hendricks thing, which, whatever happens there, I'd like to take the rematch."
Appraised of Diaz's statements, St-Pierre, in a Fuel interview, laughed and then paused before responding.
"I don't know what to say, I'm kind of disappointed hearing this," St-Pierre said. "I'm going to take the high road and say it was a good fight."
UFC president Dana White shot down the idea of an immediate rematch. "He wouldn't get a rematch off that fight," White said. "Johny Hendricks deserves the next shot."
As for what went wrong with Diaz in the fight, well, we'll let the vanquished challenger speak for himself.
"I could have had a better training camp," Diaz said. "I don't want to sit here and make excuses all day, but nobody had faith in me to win this fight. And I think I could have stopped the takedowns, I think I could have gotten the takedowns, come to think of it. I was just really flat ... I slept all the way until 8 at night. And this Canada thing, you know, I knew it was going to be something to deal with, but, I don't know, the sleep that I was getting, was it going to work with me or work against me? I'm awake now, I'm ready to fight. Come the third or fourth round I felt real good, fifth round I was a bit worn out, but, the first two rounds, you know, I think I was just, I was moving real slow. I was hoping for a knockout. To be honest, I'd like a rematch."