Floyd Mayweather and Canelo Alvarez‘s billion-dollar rematch ain’t happening — not now, not ever — so says the Mexican superstars’ promoter, Oscar De La Hoya.

Remember, the boxing legends fought back in 2013 … and Canelo — who was only 22 years old at the time — was easily handled by Floyd, losing by majority decision.

The two have been talking trash to each other publicly ever since — Canelo’s mocked Floyd for fighting Conor McGregor. Floyd went after Canelo for his positive PED test in 2018. For a second, it started to feel like they were seriously building toward a rematch.

In fact, just last year De La Hoya told us the rematch would be the biggest event in boxing history — easily a $1.5 BILLION event.

But, things have changed and now, Oscar seems to be slamming the door on getting the superstars back in the same ring.

“I think the weight is just too much now,” Oscar tells us … “Canelo can’t make 154. He fought at 175. It’s impossible.”

Oscar is pointing out that Alvarez has gone up in weight since the Mayweather fight — he weighed in at 152 pounds when he fought Floyd. But, Canelo bulked up to 175 to take on Sergey Kovalev in November and he doesn’t plan on cutting down any time soon.

Bottom line … Canelo vs. Floyd II ain’t happening “unless Floyd gets to 168.”

Jake Paul‘s pulling out all the stops for his big return to the ring … and the footage from his training sesh with boxing legend “Sugar” Shane Mosley is INTENSE.

Of course, Paul’s fighting fellow YouTube superstar AnEsonGib during a Super Bowl week extravaganza … and JP’s been training like an animal at Mosley’s gym in Big Bear.

The footage — part of DAZN’s 40 Days doc — is pretty impressive … and despite Paul wanting to avenge his brother’s loss and take on KSI, it’s clear he’s laser-focused for the January 30 fight.

KSI‘s played a huge role in making this fight happen … continuously bating Jake until he accepted the match.

“I don’t like Jake and I think the whole world doesn’t like Jake,” KSI says.

“If he does manage to get past the Big Gibber then yes, I will fight Jake. 100%. But, that’s not going to happen, I don’t think he’s ready for Gib at all and that’s going to show on Jan. 30. I think Gib wins this hands down and that will be the end of the Paul brothers.”

We’re getting closer to an Antonio Brown vs. Logan Paul boxing match!!!

Check out this footage of the unemployed NFL star hitting the mitts in a boxing gym in footage AB posted on Tuesday.

The interesting part is the video was re-posted by DAZN, the live sports streaming service that carried the Logan Paul vs. KSI fight in November.

Paul already told us his camp had begun official talks with Antonio Brown to get a fight on the books — and now it seems like DAZN could be seriously interested in getting a deal done.

As for his training, Brown’s physique looks incredible but it’s clear he needs real work in the ring to compete with Paul, who’s already got 2 fights under his belt … and looked pretty good in the KSI rematch.

Paul says he’s dead serious about fighting AB and thinks it would be a great opportunity for the 31-year-old wideout to refocus his life while he’s persona non grata in the NFL.

“I think we might be closer than anyone expects,” Paul told us last week. “I’m f**king serious, bro. You know how serious I take fighting.”

Mary Carey‘s still getting physical in her life after porn … by getting in the ring and beating the pulp outta other celebs.

The famed porn star officially signed a contract with Celebrity Boxing promoter Damon Feldman — who’s arranged for Mary to slip on some gloves and go toe-to-toe with another chick on April 18 in Miami. Catfight!!!

Naturally … the bout’s going down at a strip club called the Booby Trap. We’re guessing there will be no shortage of ring girls.

It’s the first time Mary’s stepping into the ring as a competitor, and CB’s still working on finding an opponent for the retired XXX star.

Celebrity Boxing has had some issues lately with stars like Angry Bagel Guy and Lenny Dykstra dropping out at the 11th hour — so hopefully, Mary follows through.

Mary could be in line for a nice payday … depending on her opponent and internet pay-per-view streams, CB expects her to pull in around five figures.

“She’s Muhammad Ali’s daughter, she’s not Muhammad Ali.”

That’s boxing superstar Claressa Shields essentially telling Laila Ali to put up or shut up … after Ali trashed Shields this week as an inferior fighter.

Shields appeared on the “TMZ Sports” TV show (airs weeknights on FS1) to respond to Ali’s insults … and yeah, Shields was FIRED UP!

“Let’s just keep it honest. Don’t say that I’m not talented because I’m the most talented female fighter there has been in the history of boxing.”

Of course, 42-year-old Ali went on “Sway in the Morning” and said she would destroy Shields if they ever fought because Claressa isn’t talented enough to hang with her.

FYI, Ali was 24-0 as a pro. She last fought in 2007. 24-year-old Shields is currently 10-0 and looks unstoppable.

“Laila Ali is all bark, no bite,” Shields said … “If a girl call me out, I answer.”

Shields says Ali ducked Ann Wolfe back in the day. Wolfe is widely considered one of the best female fighters of all time.

Instead, Shields says Ali’s resume is packed with bums, not legit top flight opponents.

“She fought against soccer moms and probably strippers or something. I fight real fighters.”

Now, Shields says she’s down to settle this in the ring.

Claressa says she’ll give Ali one year to train up — and even has a pay structure in mind.

“The loser gets $5 million. The winner gets $10 million.”