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Georges St-Pierre was tearing up the UFC welterweight division.
Nick Diaz was tearing up the Strikeforce welterweight division.
When Zuffa purchased Strikeforce in March 2011, GSP vs. Diaz was the first thing on the minds of many fans.
And it actually looked like it was going to happen. It had a date, a time and everything...
Until Diaz decided to skip out on two press conferences, drawing the ire of UFC president Dana White and losing his title shot at St-Pierre in the process.
In his place, Carlos Condit was given the title shot, but that too didn't pan out due to a knee injury suffered by GSP.
Thus, Diaz was put against BJ Penn. The Stockton brawler won in exciting and overwhelming fashion.
So GSP vs. Diaz was bound to happen after that, right?
GSP's injury was serious; he'd be out for quite some time. Therefore, an interim title was created and the contenders were Carlos Condit and Nick Diaz.
People thought this was basically a setup for Diaz to smash Condit, win the belt and then finally fight GSP—this time with even more hype since the UFC could market the "champion vs. champion" angle due to the interim belt.
But we all know how that wen't; Condit bested Diaz in controversial fashion (we'll get to that next slide) and now it appears as though GSP vs. Diaz might not ever happen.