In one of the oddest twists of fate in recent UFC history, Georges St. Pierre is out of the UFC 137 main event -- and Nick Diaz is back in.

"GSP" was originally slated to defend his welterweight title against Diaz in the main event of the Oct. 29 event. But Diaz was pulled from the fight after missing a pair of mandatory press conferences.

Carlos Condit was pulled from his co-main event slot opposite B.J. Penn and given the title shot, while Diaz was demoted to a bout against the Hawaiian.

But everything is different today.


St. Pierre is out with a knee injury, apparently suffered in training today. He and Condit were both pulled from the 137 card, and are expected to meet for the belt once the Canadian is healed up.

The Diaz-Penn bout was pushed to the main event slot. It will remain at three rounds.

UFC president Dana White, who broke the news of St. Pierre's injury on Twitter this afternoon, described himself as "beyond" devastated in a later tweet.

A poster later commented that White has "such a fun job."

"Not on days like this," White wrote back.

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