"I play a bit of a mind game, but I never talk about it because it's one of my tricks," St-Pierre says of his UFC 158 strategy. "Now that you said it, I'm sure other people will hear it and ask me questions about it. Unfortunately, I won't be able to answer. It's part of my strategy."
St-Pierre and Diaz were fairly respectful to each other just months ago, but the two have been trading verbal jabs over the past two weeks.
"It's not personal; it's professional," St-Pierre says. "It's not the first guy that's been disrespectful to me. Lots of other guys have tried to get into my head. ... Just about anybody I've fought other than Jake Shields and maybe Carlos Condit, they've all been very disrespectful with me, so I'm kind of used to that. Nick got under my skin, but a lot of people have got under my skin. But that's when I perform the best.
"The truth is, it's not the first time people trash-talked me, and it won't be the last," St-Pierre says. "This scenario happens for most of my fights."
Diaz called out St-Pierre for using performance-enhancing drugs and being pampered, even though he had no proof to make such baseless claims.
"The fight started a long time ago," St-Pierre says of his UFC 158 tilt against Diaz. "It's not only the 25 minutes I'm going to fight. The fight has already started."
Diaz and St-Pierre will fight on March 16 at UFC 158.