MMA Fighting brings you UFC 158 play-by-play and more for the St-Pierre vs. Diaz fight card. Tonight's event is headlined by a fight between UFC welterweight champion Georges St-Pierre and Nick Diaz. This bout is scheduled for five, five-minute rounds. Also appearing on the main card is Carlos Condit vs. Johny Hendricks, Jake Ellenberger vs. Nate Marquardt, Nick Ring vs. Chris Camozzi, and Mike Ricci vs. Colin Fletcher. Tonight's fights take place at the Bell Centre in Montreal.