UFC welterweight champion Georges St-Pierre suffered a knee injury during training on Tuesday and will miss his upcoming fight at UFC 137. (AP)
The main event of UFC 137 has changed ... again.
UFC welterweight champion Georges St. Pierre has been forced to withdraw from his Oct. 29 title fight with Carlos Condit due to a knee injury suffered during training, according to UFC president Dana White's Twitter feed.
“I just land in NYC and what do I always say!? I have to deal with bad s--- everyday!! GSP is out with an injury!!! #oneofthosedays,” Dana White tweeted on Tuesday.
St-Pierre, widely regarded as one of the two best pound-for-pound fighters in MMA (he's No. 2 in SI.com's rankings), had been training in Montreal for the 10th defense of the welterweight title he's held over two stints since 2007.
B.J. Penn will now meet Nick Diaz in the main event, while Carlos Condit will be removed from the card to wait for the champion to recover.
“It's GSP'S knee. We will sit Carlos to wait for GSP. It's looking so far like he could be ready in a couple months. Still early to tell tho,” White tweeted minutes after his initial tweet that broke the news.
The main event was originally scheduled to be St. Pierre vs. Nick Diaz, with Condit fighting Penn. But Condit took the place of Diaz when he failed to appear at a mandatory media obligation.
Now Diaz finds himself in the lone main event, but still in a three-round fight against B.J. Penn.
Condit remains next in line to challenge St. Pierre for the title.
-- Stephen Boyle