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The legendary UFC heavyweight champion Randy Couture lost in his comeback to Brock Lesnar in the main event at UFC 91 tonight in Las Vegas, as the younger, stronger man delivered a series of brutal punches and won a second-round TKO.

In the first round, they had a rough, tough wrestling match in which Lesnar spent more time in the dominant position, but neither man did a lot of damage. But in the second, Lesnar landed a brutal punch that knocked Couture down, pounced on him and continued bashing him until the referee had no choice but to step in.

It was the 45-year-old Couture's first fight in 15 months, and he looked rusty, while the 31-year-old Lesnar looked just as big and strong as ever. Lesnar also looked more patient than he had in his previous fights -- he picked and chose his spots and didn't rush into anything.

Welcome to the FanHouse UFC 91 live blog, where we'll provide live, round-by-round updates of the four big undercard fights on tonight's card: Kenny Florian vs. Joe Stevenson, Gabriel Gonzaga vs. Josh Hendricks, Demian Maia vs. Nate Quarry and Dustin Hazelett vs. Tamdan McCrory.

When the undercard is over, a little before midnight, head over to our UFC 91 Brock Lesnar vs. Randy Couture live blog.

If you just want to know who won each of the nine fights on tonight's card, visit our UFC 91 results page.

The televised portion of the undercard has begun, and our live blog begins below.

FanHouse will have live UFC 91 results for all of today's UFC 91 fights, as well as a live blog and round-by-round updates of the undercard and the main event, featuring UFC heavyweight champion Randy Couture vs. Brock Lesnar.

Full results of all the UFC 91 action are below.

The weigh in for UFC 91 took place today in Las Vegas, and we have the results.

The big news: UFC heavyweight champion Randy Couture weighed in at 220 pounds, while challenger Brock Lesnar weighed in at the heavyweight limit of 265. Lesnar will likely gain about 10 pounds through rehydration before he steps into the Octagon on Saturday night, so he'll have a weight advantage of around 55 pounds.

Everyone made weight, with a few fighters taking advantage of the one-pound buffer allowed in non-title fights.

The full results for the UFC 91 weigh-in are below.