UFC 158 took place Saturday night from Montreal, headlined by a UFC welterweight title bout pitting champion Georges St. Pierre and challenger Nick Diaz. The contest, expected to be one of the biggest pay-per-view attractions of the year, has featured a unique buildup and hype. The mercurial Diaz was selected for the title shot despite losing his last bout and failing a post-fight drug test. UFC president Dana White and St. Pierre
justified this decision by saying St. Pierre was angry at Diaz and thought the "disrespectful" Diaz " deserves a beatdown. "

Diaz spent the last week challenging this assertion, blaming St. Pierre and the UFC of manufacturing a personal issue and criticizing Diaz to sell the fight. The popular and well respected St. Pierre has faced a series of antagonistic rivals like Matt Serra
, Josh Koscheck
and Matt Hughes throughout his career, but finds himself in somewhat of a different position in the verbal offensive and defensive for this fight. The colorful and exciting Diaz, on the other hand, confronts the most important fight of his career.

In preliminary action, George Roop won a unanimous decision victory over Reuben Duran in a bantamweight contest. Team Alpha Male prospect T. J. Dillashaw won his third fight in a row, knocking out Issei Tamura with punches and a knee on the ground. And welterweight contender Rick Story rebounded from recent setbacks to score an impressive first round TKO over Quinn Mulhern.

UFC Welterweight Title: Georges St. Pierre vs . Nick Diaz

St. Pierre is one of the greatest fighters in the history of the sport, a longtime dominant welterweight champion with no unavenged losses and wins over just about every top contender. Diaz, the former Strikeforce champion, possesses a dangerous volume punching game and excellent submissions. This is the biggest fight of his career.

Round 1 . St. Pierre gets a takedown seconds into the fight. Diaz immediately secures full guard and looks to posture up his hips and threaten. St. Pierre drops down some punches and Diaz looks to take top position himself. Diaz then tries to stand up but is pulled down. St. Pierre looks to mount but can't get it. St. Pierre drops a hard elbow, the first big shot of the frame. Diaz looks to get up and St. Pierre just holds him down. Diaz finally is back on his knees but again eats alot of knees and then taken down again. St. Pierre takes Diaz's back on ground but gets loose of him. Diaz stands up again. Diaz looks for a kimura but St. Pierre bang him down again. Another conservative winning round for the champion. 10-9 St. Pierre.

Round 2 . St. Pierre again fights with few leg kicks. Diaz tries to recover from continuous hits but again recieves few blows
. St. Pierre then takes Diaz again down. St. Pierre throws punches from the top and Diaz is totally out of blocking all the punches. Diaz again tries to recover from the continuous punches as St. Pierre jerks him down.

Round 3. Diaz comes out talking trash and lets St. Pierre throw jabs to his face. St. Pierre goes for a takedown but it is blocked. Moments later, St. Pierre gets it. Diaz works his way back up. He lands a hard punch to the body of St. Pierre. He follows with leg kicks. St. Pierre answers with some crisp jabs. They each throw wild spinning kicks that miss. St. Pierre goes for a takedown with two minutes left in the round. Diaz blocks it. Diaz lands a few nice punches that knock St. Pierre back. He opens up a cut on St. Pierre and St. Pierre takes him down. Diaz swung at St. Pierre after the bell. 10-9 Diaz.

Round 4. St. Pierre again sends some nice and crispy blows to Diaz. St. Pierre tried for a take down but Diaz blocked it tackfully. St. Pierre again goes for some jabs. Diaz continually blocks next takedown. St. Pierre clinches and they exchanged some kicks near the fence. St. Pierre keeps hosting Diaz with nice jabs and takes him down right before the end up.
Round 5. St. Pierre tries for another jab and starts with some jabs. Diaz takes St. Pierre pushes him with the cage. They exchanged some knees but separates. Diaz constantly tries to turn into a better position but St. Pierre easily takes hime down and starts hosting with some punches. Diaz gets up finally with only 90 secs left to go. They clinch as the crowd starts chanting vulgarities at Diaz. St. Pierre
again takes Diaz down in the last 40 secs. St. Pierre works punches for the rest. Both of them embrace and Diaz raises St. Pierre's hand. St. Pierre then raises Diaz's hand. 10-9 St. Pierre, 49-46 St. Pierre.

Result:

Winner: Georges St. Pierre, unanimous decision (50-45, 50-45, 50-45).