It’s a case of sweet revenge for Amanda Nunes…

The 34-year-old Brazilian professional mixed martial artist defeated Julianna Peña via a dominant unanimous decision (50-45, 50-44, 50-43) in the main event of UFC 277 on Saturday night at American Airlines Center.

Nunes had vowed to make changes in her game and get her belt back after shockingly losing it seven months ago to Peña.

With the victory, Nunes, the greatest women’s fighter in MMA history, reclaimed the UFC women’s bantamweight title she lost to Peña at UFC 269 in December.

“The lioness, if they don’t get the prey the first time, I set the trap and I know I’d get it the second time,” Nunes said in her postfight interview.

Nunes said this fight was all about “strategy” and that the key was her going southpaw. Then, when Peña got comfortable on the feet, Nunes said she started to go for the takedowns.

“The main thing was my southpaw,” Nunes said. “I know I was gonna catch her with that tonight. I knew she was not gonna be able to adjust to that. She’s not a striker. … She was so confused. I’m not very good yet with my southpaw. I told my coach, ‘I’m gonna see how I feel.’ I tried tonight, and I felt good.”

Nunes dropped Peña with a check right hook out of the southpaw stance several times in the early rounds. As the fight wore on, Nunes began using her wrestling to take Peña down over and over, then cut her up from top position with slicing elbows.

Peña had several bad cuts on her face after the fourth round. Nunes nearly had a rear-naked choke finish in the fifth, but Peña was incredibly tough and fought it off.

Nunes had moments where she might have been able to finish the fight but perhaps didn’t want to make the mistake she did in the first fight, where she got tired after trying to finish Peña in the first round.

“Julianna is tough as nails,” UFC president Dana White said. “Her will to win is second to none. She wanted to win. As dominant as Amanda was, and she was dominant tonight — I don’t think it was close in any way, shape or form; I thought it was a complete shutout — she still looked a little gun shy to me.

“She had Julianna hurt many times, had her on crazy legs many times and never really went in for the kill.”

After the first fight, Nunes left her longtime gym, American Top Team, and moved into a private facility she has dubbed Lioness Studio. She trained under coach Roger Krahl, who was in her corner for some of her biggest fights, like the knockout of Ronda Rousey.

“The best thing I did was make my gym,” Nunes said. “In my gym, I feel like I’m safe. I feel like I can grow and evolve.”

In the second round, Nunes knocked Peña down three times, setting the record for most knockdowns in a round ever among women in the UFC, according to ESPN Stats & Information research. Overall, Nunes outlanded Peña 85-60 in significant strikes and took Peña down six times in eight attempts.

Nunes’ 15 UFC wins is the most among women in UFC history. This was her 10th title fight win, the most among women in UFC history and fifth best overall. Nunes is the first woman in the UFC to regain the bantamweight title after losing it.

Saturday’s fight was the 13th immediate rematch ever in the UFC after one fighter took the belt from another. Saturday marked just the third time in those instances that a fighter reclaimed the title. Randy Couture did it against Vitor Belfort in 2004 and Deiveson Figueiredo did it this past January over Brandon Moreno.

Judges Douglas Crosby and Sal D’Amato each scored the second round 10-8 for Nunes, while Crosby also scored the fifth 10-8 for Nunes. The other judge, Jacob Montalvo, did not score a 10-8 in any round.

Coming in, ESPN had Nunes ranked No. 2 and Peña ranked No. 4 on its pound-for-pound women’s MMA list. At bantamweight, Peña was No. 1 and Nunes was No. 2.

Nunes (22-5) was on a 12-fight winning streak before losing to Peña, with wins during that stretch over the likes of Ronda Rousey, Cris Cyborg, Miesha Tate and Holly Holm. The Brazilian slugger, who trains out of South Florida, is also the UFC women’s featherweight champion.

Nunes, 34, is the first UFC fighter to defend two titles in separate weight classes concurrently — and has seven title.