IFL veteran Gusmao suffered his first career defeat at his UFC debut, losing a unanimous decision to fellow newcomer “Bones” Jon Jones (6-0) who took the fight on short notice.

Mendes also lost his Octagon debut, via submission to Thiago Silva (13-0) in May, breaking his eleven-fight win streak.

The win facilitates an apparent New Year’s Eve champion-versus-champion rematch between St. Pierre and Fighters.com’s Lightweight Champion B.J. Penn (13-4-1), who was invited into the Octagon after the main event to challenge St. Pierre, saying, “I want to put this fight together.”

St. Pierre accepted Penn’s challenge, proclaiming, “I’m a proud champion.”

In the co-main event, Brock Lesnar (2-1) dominated a three-round unanimous decision over Fighters.com’s eighth-ranked heavyweight “Texas Crazy Horse” Heath Herring (28-14) by scores of 30-26 three times.

“I fell off the horse,” Lesnar told the 15,082 spectator hometown crowd referring to his Octagon debut loss to former UFC Heavyweight Champion Frank Mir (11-3), “but, tonight I got on that stallion and rode it out of town, baby! Wooo!”

Fighters.com’s seventh-ranked lightweight “KenFlo” Kenny Florian (10-3) won a blow-out unanimous decision over “El Matador” Roger Huerta (20-2-1) by 30-27 on all three judges’ score cards in a UFC top contender bout.

“I trained to not got to the judges,” a somber Florian confessed after the fight. “A little disappointed in myself, but I’m going to learn from this.”

An even more disappointed, but dapperly dressed Huerta in vest and tie insisted after his loss, “I played into his gameplan. I made mistakes and I’ve got to fix those things.”

Florian’s victory and presumed ascension to the UFC’s top lightweight contendership spot leaves the Boston native in limbo after the UFC’s promotion of a champion-versus-champion showdown between St. Pierre and Penn.

One got the feeling Florian knew before his victory that a win didn’t earn him an immediate title shot when he replied to UFC commentator Joe Rogan’s question about a title fight, “We’ll wait and see.”

Florian beat Huerta walking away, literally.

In round one, Florian ducked under Huerta’s unwieldy haymakers and put “El Matador” on the mat, then mounted him. Huerta rolled into a Florian rear naked choke, but defended successfully.

In round two, Florian continued to let Huerta come to him, backpedaling and tagging Huerta with right hooks as Huerta marched aggressively forward.

“I was chasing him in the fight and that’s something I shouldn’t have done,” admitted Huerta, then he chided Florian, “If I wouldn’t have chased him, there wouldn’t have been a fight.”

In round three, Florian zapped Huerta with a front kick to the face, the second one Florian connected in the fight.

Florian praised, “I had him in some tough positions, had him rocked a few times, but he came back. He has a heart of a champion. That’s what I expected.”

St. Pierre’s vanquished challenger, American Kickboxing Academy’s Fitch, showed the heart of a champion too in his first title fight.

Despite being floored in the first round by a St. Pierre straight right as Fitch launched a leg kick, Fitch, bloodied and stunned, battled into round two through an onslaught of punches and elbows from a mounted St. Pierre.

“I rock him,” St. Pierre said after the fight. “He’s got a very good chin.”

St. Pierre yanked the reigns in a paced round two, which Fighters.com scored 10-9 for Fitch after Fitch pummeled St. Pierre’s body and landed a clean left hook to St. Pierre’s head.

“I was not in trouble,” St. Pierre insisted. “I was trying to pace myself because after the first time I rock him and I couldn’t finish him, I was like, ‘Man, this guy, I’m going to have to almost to kill him to win.’”

Round two would be the last round in which Fitch would challenge St. Pierre.

St. Pierre took Fitch down at will throughout the five rounds and, in round three, replayed the G’n'P onslaught that Fitch endured in round one.

The damage accumulated; and, Fitch’s stand-up, which, ironically, produced the former wrestling All-American’s best offense, grew sloppier.

St. Pierre began to land cleaner shots and more often, including a spinning backfist in round four that drove Fitch to the cage.

Round five was dominated on the mat by St. Pierre; but, both fighters were spent and produced little meaningful offense in the round.

“This loss is maybe the best thing that happened to [Fitch],” said St. Pierre. “It will only make him stronger.”

In heavyweight undercard action, Cheick Kongo (12-4-1) out-classed Octagon debuting Dan Evensen (10-3) in a first-round TKO at 4:55, then presumptuously asked the UFC for a title shot.

Welterweight Chris Wilson (14-4) won his UFC second chance over Steve Bruno (11-4) by unanimous decision.

“I’d like to not start waiting five and six months. I need to fight more often,” Wilson revealed after his UD. “So, if Uncle Dana [White] is willing to put me in sooner… He’s the boss.”

Lightweight Robert Emerson (8-6) knocked out TUF 5 runner-up “Pitbull” Manvel Gamburyan (8-3) in twelve seconds with a right overhand, followed by a left to Gamburyan’s temple as he fell to his back.

“I saw him throwin’, so I threw. You know, luckily mine landed first,” described Emerson after his impressive second UFC win. “Things are lookin’ up for me.”

Middleweight Abu Dhabi champion grappler Demian Maia (8-0) tapped a game, but out-classed “Athlete” Jason MacDonald (20-10) in a rear naked choke at 2:44 of round three in a dramatic back-and-forth mat battle.

“I just go and fight,” Maia said matter-of-factly after the stoppage.

TUF 6 middleweight “Berserk” Ben Saunders(6-0-2) remained undefeated with an armbar submission of Ryan Thomas (9-2) at 2:28 of round two.

“People go for the takedown, get a leg. I swung around to almost like a half-back type position. Did my homework, figured out exactly what I can do from there and [the armbar] was one of them, man,” described Saunders after the fight.

Welterweight “Barn Cat” Tamdan McCrory (9-1) won a unanimous decision over TUF 2 finalist Luke Cummo (6-6).

“I thought I broke his arm [in an armbar],” McCrory said after the fight. “I felt a little ring rust, but, I mean, I felt pretty good for nine months off. I’m ready to get drunk, man.”

Light heavyweight Jon Jones (6-0) won a unanimous decision over Andre Gusmao (5-1) in his Octagon debut.

“The win feels great,” Jones said. “I thought about this many nights, dreamin’ about it.”

Jones replaces the previously-scheduled “Travolta” Tomasz Drwal (14-2) on the card.

Jones TKO’d Moyses Gabin (2-2) in the second round at the Battle Cage Xtreme event 12 July to win the USKBA East Coast title.

Andre Gusmao (5-0) will face “Travolta” Tomasz Drwal (14-2) in a light heavyweight match-up, and welterweights “The Silent Assassin” Luke Cummo (6-5) and “The Barn Cat” Tamden McCrory (8-1) will meet.

Gusmao almost signed with the UFC in February to fight David Heath (8-3), but happened to still be under contract with the IFL. His last fight was in September.

Drwal tallied a loss against Thiago Silva (13-0) by second-round TKO in September at his UFC debut, ending a thirteen-fight win streak.

TUF 2 competitor Cummo is coming off a loss by unanimous decision to Luigi Fioravanti (12-3) at UFC 82 in March.

McCrory’s only loss of his professional career came during his last fight at UFC 78 in November, when PRIDE veteran Akihiro Gono (28-12-7) submitted him with an armbar in the second round.