UFC 217: GSP among 3 new champions crowned at MSG

View all the action from a star-studded UFC 217 that featured three championships change hands at Madison Square Garden in New York City.

Middleweight Championship Bout: Georges St-Pierre def. Michael Bisping via 3rd-round technical submission (rear-naked choke)

What. A. Comeback.

In his first fight in four years, St-Pierre returned to the UFC in scintillating form. The Montreal native started hot, taking the first round with a great striking performance and wrestling takedown. He appeared fatigued in the second round and ate a series of strikes early in the third that caused his face to be bloodied - but it was far from over.

GSP recovered to drop Bisping with a hard right hand. He jumped on top of the champ, smothering him with elbows before slipping to Bisping's back and sinking in the rear-naked choke. Bisping refused to tap, but an apparent loss of consciousness forced referee John McCarthy to rule GSP the winner and new middleweight champion. It was GSP's first stoppage win since UFC 94 in January 2009.

Related: GSP chokes Bisping unconscious, wins UFC 185-lb title in return to action

Bantamweight Championship Bout: TJ Dillashaw def. Cody Garbrandt via 2nd-round knockout

Who needs Team Alpha Male? Not TJ Dillashaw.

The 31-year-old took his second career bantamweight title in stunning fashion Saturday night. After losing the first round and appearing to be wobbled by a late knockdown, Dillashaw dropped Garbrandt with a head kick early in the second frame and kept the attack going. He cracked his opponent with a right jab and followed him to the mat, overwhelming Garbrandt with head shots before the official ruled a knockout with 2:23 remaining.

In his postfight interview, Dillashaw called out flyweight champion Demetrious Johnson, claiming that he's ready to drop to 125 pounds and stop the title holder's record-breaking win streak.

Related: Dillashaw recaptures UFC 135-lb title with 2nd-round knockout of Garbrandt

Strawweight Championship Bout: Rose Namajunas def. Joanna Jedrzejczyk via 1st-round knockout

Just like that. The streak is over. "Thug Rose" is your new strawweight champion.

Namajunas dominated Jedrzejczyk in a way the UFC has never seen before. The 25-year-old challenger knocked down the longtime champion inside the first two minutes, but could not finish, seeming to miss her opportunity. Namajunas didn't give up, however, dropping Jedrzejczyk with a heavy left before jumping on top and pounding her opponent until she tapped due to strikes at the 2:01 mark of the opening round.

Related: Namajunas stuns Jedrzejczyk by 1st-round KO to win UFC strawweight title

Welterweight Bout: Stephen Thompson def. Jorge Masvidal via unanimous decision

Thompson controlled the bout throughout, keeping Masvidal at a distance with his unorthodox karate stance. The first round saw little action, though the pace picked up in the following rounds as Thompson landed a handful of knockdowns while Masvidal battered his opponent's face. Masvidal appeared tentative in the first two rounds, but pushed forward in the final frame, sensing Thompson had won the first two rounds. He could not land the knockout strike he needed to get the victory, as the judges scored the fight 20-26, 30-27, and 30-27.

Related: Wonderboy dissects Masvidal en route to lopsided decision victory

Middleweight Bout: Paulo Costa def. Johny Hendricks via 2nd-round TKO

In his first fight since switching his official name from Borrachinha, Costa looked like a force to be reckoned with in his third UFC middleweight bout. Physically towering over Hendricks - who lost for the seventh time in his last 10 fights - Costa controlled the pace of the first round, landing a barrage of strikes. Costa started the second round hot, continuing his relentless striking attack that included a streak of head shots to finish Hendricks at the 1:23 mark and improve to 11-0.

Related: Costa clubs Hendricks with barrage of strikes for 2nd-round TKO

Lightweight Bout: James Vick def. Joe Duffy via 2nd-round TKO

After Duffy took the first round with crisp striking and a pair of takedowns, Vick rallied in the second with some solid stand-up of his own, keeping the Irishman at the end of his reach with a varied attack. As Duffy closed the distance against the fence, Vick floored him with a counter right uppercut before swarming with follow-up punches for the buzzer-beating TKO.

Related: Vick cracks Duffy with uppercut for buzzer-beating TKO

Heavyweight Bout: Mark Godbeer def. Walt Harris via 1st-round disqualification

Godbeer and Harris didn't find any closure the second time around.

In a meeting that was rebooked a month after Harris stepped up to fight Fabricio Werdum on hours' notice at UFC 216, Harris was disqualified with 31 seconds to go in Round 1. After kneeing Godbeer in the groin, the 34-year-old carried on fighting - despite the referee's clear call to halt the action for Godbeer to recover - and cracked the Brit with a kick to the head that rendered him unable to continue.

Light Heavyweight Bout: Ovince Saint Preux def. Corey Anderson via 3rd-round KO

The day Saint Preux's heavy workload does him in has not yet dawned.

Filling in for Patrick Cummins in his fourth fight of the year, the 34-year-old saw his edge in striking neutralized by Anderson's wrestling through much of the first two rounds. But when the fight remained upright in the early goings of Round 3, Saint Preux made the most of the opportunity, cracking Anderson with a stunning head kick that sent him to the shadow realm at the 1:25 mark.

Watch: OSP ends Anderson's night with perfect head-kick KO

Welterweight Bout: Randy Brown def. Mickey Gall via unanimous decision

Brown derailed the Gall hype train with a workmanlike effort.

In a battle between a pair of "Lookin' for a Fight" discoveries, the 27-year-old got Gall to the mat in Rounds 1 and 3 and stayed busy by peppering him with ground-and-pound, while Gall pocketed the second stanza by smothering Brown from top position for the bulk of it - albeit without inflicting much damage.

Brown's work from Gall's guard had his foe leaking crimson by the final round en route to a sweep of the scorecards that marked the latter's first loss as a pro.

Heavyweight Bout: Curtis Blaydes def. Aleksei Oleinik via 2nd-round TKO (doctor's stoppage)

A disaster was averted thanks to the New York State Athletic Commission's recent adoption of instant replay. The referee stopped a veritable slobberknocker of a fight when Blaydes grazed a grounded Oleinik's ear with an illegal kick.

Oleinik was ultimately ruled unable to continue by the cageside physician, but the officials agreed his inability to fight was due to the bevy of uppercuts he'd taken to the noggin and not the kick that barely made contact, thereby anointing Blaydes the winner by TKO - as opposed to declaring the fight a DQ or no-contest - at the 1:56 mark of Round 2.

Bantamweight Bout: Ricardo Ramos def. Aiemann Zahabi via 3rd-round KO

After Ramos took the first round with his superior grappling and Zahabi the second with a sharp jab and right uppercut that repeatedly hit pay dirt, the former made the latter pay for upping the pressure in Round 3. Ramos cracked a charging Zahabi flush with a spinning back elbow from hell that had him seeing stars from the canvas less than two minutes in.

Watch: Ramos kicks off UFC 217 with spinning back elbow KO of Zahabi