Ronda Rousey’s long-awaited return to the Octagon was short-lived.

The former champion was knocked out by Amanda Nunes 48 seconds into the first round after taking a barrage of punches to the head. Rousey was back in the ring for the first time in over a year—her first fight since her stunning defeat against Holly Holm from the “kick heard round the world—and she finished with another stunner.

Nunes attacked from the opening of the round and never let up, retaining her bantamweight championship title. Referee Herb Dean was forced to call it after Rousey took multiple blows from Nunes while on the cage of the Octagon.

Although Rousey lost the fight, she'll still bring home a $3 million paycheck, tying with Conor McGregor for the biggest in mixed martial arts history. After such a devastating loss, this could be the last fight of Rousey's career.

Rousey had trained hard and got herself into great shape—just look at this before and after photo—but it wasn't enough to beat Nunes. Rousey first lost the bantamweight title to Holm before it changed hands from Miesha Tate to Nunes.

Rousey-Nunes was the most anticipated fight, but there were some other great matchups on the docket too, including the co-main event, with Cody Garbrandt beating Dominick Cruz to win the a bantamweight title after a 5-round match.

See the Men's Fitness live blog recap of the event below with highlights from UFC 207:

12:51 a.m.

That ended pretty fast:

 

 

12:48 a.m.

WOW. Nunes tags Rousey hard and takes it with a TKO. Rousey never really hit her at all, wow.

12:44 a.m.

The champion is ready:

12:41 a.m.

Rousey is ready for battle:

Ronda makes her entrance:

12:36 a.m.

Now it's time for the big event: Ronda Rousey will try and take the Women's Bantamweight Title from Amanda Nunes. 

12:30 a.m.

Garbrandt wins. Cody is the new champion:

12:20 a.m.

That hurts:

12:18 a.m.

Garbrandt has the crowd behind him and had a strong Round 4:

12:12 a.m.

Garbrandt cuts Cruz, gets him bleeding, and then Cody keeps trash talking and taunting. Wow, what a Round 3:

12:07 a.m.

These guys are putting it all on the line:

11:59 p.m.

This one is going to be intense:

11:53 p.m.

Two men enter:

11:49 p.m.

Rousey vs. Nunes is coming soon—but first it's Dominick Cruz and Cody Garbrandt for the bantamweight title.

11:40 p.m.

Dillashaw gets the win—and a title fight next?:

11:36 p.m.

Dillashaw shows what he can do:

11:20 p.m.

The match between T.J. Dillashaw and John Lineker gets started in style with help from Bruce Buffer:

11:12 p.m.

The stars are out for UFC 207:

The results are in: Dong Hyun Kim defeats Tarec Saffiedine via split decision (27-30, 29-28, 29-28)

11:07 p.m.

These guys are tough—really tough:

11:04 p.m.

Round 3 of Saffiedine vs. Kim gets intense:

10:59 p.m.

Dong Hyun Kim and Tarec Saffiedine gets started up:

10:45 p.m.

The main event is coming soon. Ronda Rousey and Amanda Nunes are in the house:

10:36 p.m.

Former Men's Fitness cover star and Arizona Cardinals wide receiver Larry Fitzgerald is pumped for the big event—he also told us he's a big fan of Game of Thrones (read about his training and nutritional routine here):

The result is in: Ray Borg defeats Louis Smolka via unanimous decision (30-27, 30-26, 30-26)

10:34 p.m.

The lovely UFC Octagon Girls are ready for the big fights:

10:29 p.m.

Ray Borg and Louis Smolka do battle to start the PPV:

10:19 p.m.

Ronda is in the house:

10:07 p.m.

Men's Fitness cover star Dana White is pumped to get the pay-per-view card started:

10:05 p.m.

Magny gets the win:

9:57 p.m.

ICYMI earlier, retired champion fighter Urijah Faber drops in and hangs with Cody Garbrandt before his fight against Dominick Cruz:

 

Ready to Rumble! @ufc #ufc207 @cody_nolove @teamalphamalemma

A photo posted by Urijah Faber (@urijahfaber) on

 

9:46 p.m.

Neil Magny gets some shots in on Johny Hendricks in Round 1:

9:40 p.m.

The champ is here! Chicago Cubs star Kris Bryant (a Las Vegas native) is in the house. Check out what Bryant told Men's Fitness about the toughest workout he ever did, his favorite cheat meal, and his top fashion advice.

9:35 p.m.

Antonio Carlos Junior gets the win:

9:20 p.m.

Vettori gets in some major shots in Round 2:

9:17 p.m.

Eye poking goes both ways in Round 1 between Antonio Carlos Junior and Marvin Vettori:

9:15 p.m.

Antonio Carlos Junior surprises everyone with his intro with "Let's Twist Again":

9:00 p.m.

The first knockout of the night—Alex Garcia takes down Mike Pyle with a brutal punch:

 

8:40 p.m.

We know what Carolina Panthers quarterback Cam Newton is up to tonight:

 

8:37 p.m.

The UFC Octagon Girls—see more of them on their official Instagram—are ready for 207 in Vegas:

 

Are you ready??? We are!!!! #ufc207 #sogood @ariannyceleste @ufc @ufcoctagongirls #vegas #nye

A photo posted by Brittney Palmer (@brittneypalmer) on

 

8:20 p.m.

Ronda Rousey is set to bring home a big paycheck for UFC 207: