GSP was supposed to fight at UFC 137, but an injury knocked him out of the main event. Instead, he tells MMAWeekly.com who he believes will win between BJ Penn and Nick Diaz.
St-Pierre was in Las Vegas to support his training partner Francis Carmont, but took a few moments to make his pick in the main event.
Who did GSP pick? BJ Penn or Nick Diaz?
Watch the video below to find out.