LAS VEGAS >> Brock Lesnar returned from a 4 1/2-year UFC absence with a unanimous-decision victory over Mark Hunt, and Nunes took the bantamweight title from Miesha Tate with a stunning first-round stoppage at UFC 200 on Saturday night.
Jose Aldo also won a competitive decision over Frankie Edgar to claim the interim featherweight title on the UFC's star-studded landmark show.
Daniel Cormier dominated a decision over Anderson Silva, who took the fight on two days' notice after Jon Jones was dropped from the main event for failing a drug test.
While Brazil's Nunes shocked Tate in the main event, the hulking Lesnar (6-3) was the greatest curiosity on the card. The pro wrestler earned his first mixed martial arts victory since July 2010, dominating Hunt with wrestling skill and sheer mass.
"I'm older, and when I decided to make this comeback, it was a hard decision," the 39-year-old Lesnar said. "I'm glad I did. This goes to show for everybody out there, if you don't stick your neck out, you'll never get ahead."
UFC 200 capped three fight cards over three days for the world's dominant MMA promotion, which used a golden canvas for its first event in T-Mobile Arena, the spacious new entertainment venue just off the Las Vegas Strip.
The UFC stacked the card with compelling matchups, and while every fight wasn't a classic, the underdog Nunes' victory was a stunner.
"Everybody knows that I respect Miesha a lot, (but) I'm the new champion," said Nunes, also the first openly gay champion in UFC history. "For years I've been working hard for this moment. I feel amazing."
Nunes (14-4) became the fourth different fighter to hold the UFC's 135-pound belt in the last eight months since Ronda Rousey lost it to Holly Holm. Holm lost the belt to Tate in March, but Nunes dominated Tate (18-6) from the start, stunning her with multiple big shots.
Tate was bloodied and unsteady by the time Nunes sunk in a rear naked choke and ended it 3:16 into the first round.
"When I saw she was hurt, I controlled myself, because I know she can come back," Nunes said. "I made sure she couldn't come back anymore."
Lesnar made a UFC-record $2.5 million guaranteed purse for his first bout since late 2011, returning to the sport where he won and lost the heavyweight title during a meteoric MMA career. Although he walked away after consecutive losses and serious health problems, he couldn't stop thinking about a return while racking up easier money in the WWE.
The main-event star of UFC 100 seized the opportunity to be on another landmark show, and his performance showed that his inimitable athleticism hadn't diminished. Lesnar never wandered into trouble against the famously heavy-handed Hunt, repeatedly taking down his veteran opponent and keeping him pinned to the canvas.
"I wanted to finish the fight, but the guy's got a coconut head," Lesnar said. "My ground-and-pound, I'm sure he's going to feel it tomorrow, just as I'm going to feel his punch tomorrow."
Lesnar dominated the final three minutes, punishing a prone Hunt with his cartoon-sized fists. All three judges scored the bout 29-27 for Lesnar, who sounded tentatively interested in another MMA bout — after he performs for the WWE this summer.
"It's really too soon, and I have no idea (about continuing in the UFC)," said Lesnar, who turns 39 on Tuesday. "I believe any man can do whatever he wants to if he puts his mind to it. I've been out of this game for five years, and I trained for six weeks. ... I think I'm top 10. That puts me right back in the game."
The 41-year-old Silva (33-8) stepped up to fight the UFC's light heavyweight champ after Jones was ruled out Wednesday night. Although Silva is 45 months removed from his last victory — and seven weeks removed from gallbladder surgery — he gamely took a shot at Cormier, who was denied a lucrative, career-defining rematch with the troubled Jones.
Cormier (18-1) had little trouble with one of his heroes, largely keeping Silva pinned to the canvas on his back. Silva goaded Cormier into a few striking exchanges, and he even hurt Cormier slightly in the final minute, but the champ won 30-26 on all three cards.
"I appreciate the UFC for getting me this fight," said Cormier, who still made half of the guaranteed $1 million he would have earned against Jones.
Aldo put on a masterclass in his return, cutting Edgar in the first round and tormenting him for four more rounds. Aldo reclaimed one version of the belt he held until his 13-second knockout loss to Conor McGregor in December — and he's also likely to get the lucrative next shot at McGregor whenever the 145-pound champion finally returns to their division following his second bout with Nate Diaz next month.
The Irish star stood amid the floor crowd at cageside when the fight began. Afterward, Aldo put on his belt and immediately made threatening gestures at McGregor, who shouted back at his most bitter rival.
"I have one goal left, and that's to beat this guy," Aldo said.
The pay-per-view card opened with former heavyweight champion Cain Velasquez brutally stopping Travis Browne in the first round of a bout that could have headlined many other UFC cards.
The oft-injured Velasquez (14-2) had fought just once since October 2013, losing his belt to Fabricio Werdum a year ago. He showed vintage form against Browne (18-4-1), who got wobbled by a spinning wheel kick and then battered to the ground repeatedly.
Velasquez finished his heavyweight-record 10th knockout victory with 3 seconds left in the round.
Title contenders T.J. Dillashaw, Kelvin Gastelum and Julianna Pena won clear, entertaining decisions on the undercard. The first three fights at UFC 200 ended with first-round stoppage victories for UFC veterans Joe Lauzon, Jim Miller and Gegard Mousasi.