Demetrious Johnson (30-4, 17 finishes), the former longtime UFC flyweight champion, will get a second crack at earning the ONE Championship 135-pound title on Friday (8 p.m. ET) when the Singapore-based promotion makes its debut on Prime Video. Ahead of his rematch against Adriano Moraes (20-3, 14 finishes), who won the first fight via knockout last April, “Mighty Mouse” chatted Tuesday via Zoom with The Post’s Scott Fontana for this week’s Post Fight Interview.

Q: Last time we saw you compete was that unique mixed fight against ONE Muay Thai champion Rodtang Jitmuangnon, with alternating Muay Thai and MMA rounds. They said on the broadcast you were prepared for a “living hell.” What did you think of that initial Thai round once the bell sounded?
A: Yay! Went to the second round. Like you said, I knew the first round was gonna be difficult because Rodtang is just a bruiser, comes forward, throws lots of combinations, hits hard, can take a shot. [Made sure to] prepare myself that the first round’s gonna be rough. And once you get done with the first round, I knew the second round was gonna be difficult to get to him because I knew he was gonna be on his feet moving, running. And when I was able to get to takedown and get his back and submit him, I was like, “Dope.”

Q: You’ve mentioned being interested in fights with great kickboxers like Giorgio Petrosyan. Would that be mixed rules or straight kickboxing?
A: Well, considering the fact that Giorgio Petrosyan is way bigger than me, that probably wouldn’t happen. And would I do a kickboxing fight? Maybe, but those guys take way too much f–king damage, man. It’s back and forth, back and forth. So, as of right now, no. I’m gonna stick with mixed martial arts, and then we’ll see what happens.

Q: Chael Sonnen seemed to come to your defense recently by saying “That was not Demetrious Johnson” in the first fight against Moraes. Do you think anything was particularly abnormal for you that day?
A: No, not at all. I think what happened is I just got caught with the uppercut. It’s the first time chasing somebody who likes to do certain things. So this time, we’re gonna play it a little bit different and see how it goes.

Q: What did you learn about Moraes in the first fight that you didn’t realize fully going into it?
A: That he’s on his bike. He moves a lot. He uses a lot of movement. Watching the tape and then getting in there and actually seeing it as I saw when I was in there, and when I get back out, I was like, Yes, he does move a lot. And then watch him fight Yuya Wakamatsu [in March]. I was like, He does move a lot.

Q: There’s a distinct difference in size between the two of you. Did he feel a lot bigger than you, standing 5-foot-3, in there than past opponents?
A: Well, obviously, yeah. He’s [5-foot-8]. You feel that when you try to get to him. And then obviously, when he’s laying on you, he’s got longer limbs that are entangling you. So when I fought Tatsumitsu Wada [in 2019], I thought the same thing: just long bodies, long legs. It’s just the weight class I’m in.

Q: How does weight cutting work for you personally in ONE, with its anti-dehydration protocols, compared to when you were in UFC getting to 125? What do you or don’t you do now?
A: I kind of do the same thing. The biggest thing is that I just don’t dehydrate myself, so I’m still hydrated when I weigh in at 35. But sometimes, I’ll jump in a tub and cut extra water weight. That’s my plan on doing this time, just because I don’t feel like working out [on] the day of weigh-ins.

Q: What do you expect you’ll weigh for the fight?
A: Probably 140.

Q: That’s pretty typical for you.
A: Yeah, 140, 142. Even when I fought at 125, I weighed, like, 138 walking to the cage. So with this, I’m hydrated when I weigh in, and I put the weight back on me pretty fast.

Q: You and your former opponent Henry Cejudo have connected and trained together. What did you gain most from the experience?
A: Just seeing how we’re different athletes, to be honest with you, and then getting the insight of what his camp views in me, and him understand what I view of his camp and him as an athlete. It was a great experience, and we’re gonna continue to train together when I go down to Arizona. And it’s the beginning of a good relationship.

Q: Are you still frenemies? Not friends or enemies?
A: No, we’re friends. I consider him a friend. Went to his house, met his wife, met his daughter. He came to my house, met my mother-in-law, met my wife, my kids. I will consider us … if I was in Arizona, I would call him and say, Hey, do you want to hang out? You want to train?

Q: Cejudo is obsessed with custom pillows, like the one it looked like he had of your face in the photo of you two. Did he give you a pillow?
A: He has not yet, which is very, very unfortunate. He needs to give me one. No, he’s doing good things with the pillow business, so I’m happy for him.

Q: If you could choose the type of pillow, do you want a face pillow as he likes to give, or do you want something more gaming-related, or something else?
A: Games would be dope. That would be dope. 

Q: Do you recall your first experience watching MMA?
A: It was probably “The Ultimate Fighter” [with] Rashad Evans. And UFC, Andrei Arlovski and Mirko Cro Cop in Pride. Those are probably my earliest things I can remember.

Q: Did that first experience resonate in any special way?
A: I’m like, this is f–king dope.

Q: Typical walkaround weight between fights?
A: 140, 142.

Q: You compete at your walkaround weight?
A: I saw a note to myself back in 2012, basically going over my weight cutting thing, and I weighted exactly the same. I’ll post. I’ll do that post today; maybe I’ll do it on my stories. But it was literally the same weight: 142, 140. And it’s like, that was 10 years ago. So for me, I’ve always been this size. I’m like Matt Serra; I’m an in-betweener. I can’t make 125, but I’m a good size for 125 and the strawweight division here in ONE Championship. But I’m not [as] massively big, height-wise, than Tatsumitsu Wada or Wakamatsu, the 5-6, 5-8, 5-9 guys. I’m that in-betweener. I’m the same height as all the [strawweights] like Jarred Brooks, Alex Silva; we’re the same height. I’m like, I don’t know how the f–k you guys make 125. But I’m just stuck in that middle right there.

Q: Favorite post-weight cut meal?
A: Something healthy. Been having some chicken breast with some quinoa, spinach with some pumpkin and some sweet corn. I pretty much eat healthy when I get back home.

Q: Favorite fight of yours from your regional days?
A: When I fought Lupe Hudgens [as an amateur], I was fighting in a casino, and we’re fighting, and I hit him, broke my hand on his head, and then I kept on fighting. And then I dropped them again, and he wanted to go to the ground, and I was like, Get the f–k up! So that was a pretty dope fight because I was just beating the hell out of him with a broken hand.

Q: Who in MMA do you most admire?
A: Man, I spent 30 minutes this morning watching Charles Oliveira. That fight against Justin Gaethje, it was just slow motion. And when Justin threw that leg kick and he stepped over, came close, blocked the left hand, and he got hit with an uppercut, came back, measured and “Bam!” landed that right hand. I was like, F–k, dude, you’re amazing.

Q: You and Georges St-Pierre are the most common answers for that question.
A: That’s awesome. I’m grateful.

Q: What’s the coolest technique in combat sports?
A: I don’t think [of] techniques. I think [about] concepts. … Concepts can be applied everywhere. The concept of distance can be applied on the feet. It can be applied on the ground, as well. Movement is a great concept.

Q: Favorite movie?
A: I’m a big ‘80s, ‘90s kid. “Pumpkinhead,” “Predator,” “Alien,” “Aliens.” I can always watch those ones. Those are always amazing movies. “Predator 2.”

Q: Did you see “Prey?”
A: I love it. It was amazing.

Q: Favorite outdoor activity?
A: Riding dirt bikes.

Q: As a game, what’s your favorite classic video game?
A: The Super Nintendo was a very, very big part of my upbringing. “Mario,” “Super Metroid,” “Legend of Zelda: A Link to the Past,” “Super Mario World,” “Super Ghouls ‘n Ghosts.” Super Nintendo was a big part of my life. “Chrono Trigger,” “Final Fantasy VI.” There would be times me and my brother would stay up all night playing those games. Those are memories I cherish.