ニック・ディアス
Dana White confirmed via Twitter that St-Pierre's next opponent would be Nick Diaz at UFC 137 at the Mandalay Bay Event Center in Las Vegas, Nevada. However, at the UFC 137 press conference, White announced that Carlos Condit would no longer face B.J. Penn and instead would replace Nick Diaz, who had failed to show up for any event related press appearances. Condit was to face St-Pierre for the UFC Welterweight Title at UFC 137. On October 18, 2011, it was announced that St-Pierre had pulled out of the fight due to a knee injury. After conferring with management and UFC officials, Condit elected not to compete against a replacement fighter at "UFC 137", but face St-Pierre in early 2012. In a strange turn of events, Nick Diaz fought and defeated B.J. Penn at UFC 137 and UFC officials decided to have St-Pierre return and fight Diaz at UFC 143. According to White, St-Pierre said "He's [Nick Diaz] the most disrespectful human being I've ever met and I'm going to put the worst beating you've ever seen on him in the UFC."