UFC 158: St. Pierre vs. Diaz took place on March 16, 2013 at the Bell Centre in Montreal, Quebec, Canada.
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MAIN CARD (Pay-per-view)
• Georges St. Pierre vs. Nick Diaz (UFC Welterweight Championship): Georges St-Pierre def. Nick Diaz via unanimous decision (50-45, 50-45, 50-45).
• Carlos Condit vs. Johny Hendricks: Johny Hendricks def. Carlos Condit via unanimous decision (29-28, 29-28, 29-28)
• Nate Marquardt vs. Jake Ellenberger: Jake Ellenberger def. Nate Marquardt via KO (strikes) at 3:00 of Round 1.
• Nick Ring vs. Chris Camozzi: Chris Camozzi def. Nick Ring via split decision (29-28, 28-29, 29-28)
• Mike Ricci vs. Colin Fletcher: Mike Ricci def. Colin Fletcher via unanimous decision (30-27, 30-27, 30-27)
PRELIMINARY CARD (FX)
• Patrick Cote vs. Bobby Voelker: Patrick Cote def. Bobby Voelker via unanimous decision (29-28, 29-28, 29-28)
• Antonio Carvalho vs. Darren Elkins: Darren Elkins def. Antonio Carvalho via TKO (punches) at 3:06 of Round 1.
• Dan Miller vs. Jordan Mein: Jordan Mein def. Dan Miller via TKO (strikes) at 4:42 of Round 1.
• Daron Cruickshank vs. John Makdessi: John Makdessi def. Daron Cruickshank via unanimous decision (29-28, 29-28, 29-28)
PRELIMINARY CARD (Facebook/Youtube)
• Rick Story vs. Quinn Mulhern: Rick Story def. Quinn Mulhern via TKO (strikes) at 3:05 of Round 1.
• TJ Dillashaw vs. Issei Tamura: T.J. Dillashaw def. Issei Tamura via KO (strikes) at 0:26 of Round 2.
• Reuben Duran vs. George Roop: George Roop def. Reuben Duran via unanimous decision (29-28, 29-28, 30-27)
