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Jake Paul can multitask -- here he is threatening to "f**k up" Deji ... while some dude repeatedly punches him in the stomach!

Jake and Deji are just 5 days away from their boxing match in England -- an event that some say could have more viewers than Mayweather vs. McGregor.

The main event features Jake and Deji's older brothers -- Logan Paul vs. KSI -- two YouTube stars who both claim they're using this fight as a step toward becoming pro fighters.

As for Jake and Deji -- no pro aspirations here ... these guys just hate each other.

Wanna see Logan Paul throw fists at his brother, Jake Paul?? Well, better hope for a crappy Thanksgiving in the Paul household.

Logan tells TMZ Sports the ONLY way he'll step in the ring with his YouTube star little brother is if the two have "real-life" beef.

Judging by the way the two palled around when we got them at LAX this week ... don't bet on that happening any time soon.

It's too bad ... 'cause the two have been training like maniacs for their August 25 superfight with KSI and Deji -- so a Paul showdown would be must-see (YouTube) TV afterward.

Eddie Hearn -- the promoter in charge of Anthony Joshua's career -- says the fight between Logan Paul and KSI is an insult to hardcore boxing fans ... an insult he'd LOVE to promote.

Hearn basically controls boxing on the other side of the pond ... promoting not only AJ, but stars like Amir Khan, Daniel Jacobs and Tony Bellew.

Being that the fight is happening in his backyard in Manchester, we had to get Hearn's take on the event, and he told us he HATES IT and LOVES IT, all at the same time.

"How can you not congratulate them? This is a venture that's got a lot of people talking. Again, from a hardcore boxing fan's point of view, it makes my skin crawl. But, from a promoter's point of view, I have to say congratulations."

Hearn's point is clear ... he says Logan and KSI have managed to capture the interest of non-boxing fans, which Eddie says is the key to making a big splash on pay-per-view.

Jake Paul ain't just training for his superfight with YouTube star Deji by pummeling his friends in his living room boxing ring ... he tells TMZ Sports he's getting LEGIT coaching from "Sugar" Shane Mosley too!

We got the Internet sensation (and his smokin' hot GF, Erika Costell) leaving a workout with world class trainer Phil Paolina in the Valley on Monday when he revealed one of boxing's all-time greats is giving him pointers.

He says there are others in his corner as well -- including his own version of Mr. Miyagi -- all getting him ready for the Aug. 25 fight that could be bigger than McGregor-Mayweather.

Logan Paul ain't the only Paul whoopin' ass in the ring ...

Here's little bro Jake Paul beating the snot out of one his sparring partners ahead of his huge fight with KSI's little bro, Deji, on August 25.

Paul hits him with a few body shots, then a few head shots, and finishes him in a tangled mess in the ropes.

You can see Jake's big bro, Logan, watching the session from outside the ring -- and loving it.

A couple of guys who were at the house rushed over to help the sparring partner. If they REALLY wanted to help, they woulda taught him how to counterpunch.

By the way ... the ring is in Jake's living room -- 'cause he's THAT serious about winning in the YouTube stars' tilt later this month.

Remember ... TMZ Sports also got video of Logan putting a beating on his sparring partner during a training sesh back in June when he put the guy on his ass with a solid left hook.

KSI is in some SERIOUS trouble come August 25 ... so says Logan Paul's old roommate, Mark Dohner, who tells TMZ Sports he knows firsthand what the social media star is capable of doing.

Dohner -- who has more than 2 MILLION subscribers on YouTube -- says he's had his fair share of scuffles with Logan in the 2 years they lived together ... and thinks KSI's gonna be severely outmatched.

"I think physically, Logan's a beast. He's so strong, he's got reach. I would never in my life pick a fight with Logan Paul."

ICYMI -- we spoke with KSI last week ... and he said he's trying to kill Logan's ego by making 2018 the worst year of his life.

As for Logan, we've obtained video of a recent sparring sesh, and he knocked a dude straight on his ass.

Is it fight day yet??

KSI's fight with Logan Paul is set to be one of the biggest sporting events of the year ... but the British YouTuber says he's got even BIGGER plans in mind ... telling TMZ Sports he's dead set on going pro!!

We spoke with KSI -- who more than 19 MILLION subscribers on YouTube -- about the August 25 fight in Manchester, and he says he's not putting on an act ... his hatred for the Pauls is VERY real.

"I think his ego needs to be put right down." KSI says. "He thinks he's the sh*t and I'm about to f*ck him up and literally put him in his place."

"I want this year to be the worst year of his life, 100%. Pretty much, I want to squeeze every bit of relevancy from him and then move on to my bigger goal, which is to go pro."

We also asked KSI what he thought about our video of Logan knocking a dude on his ass in a recent sparring sesh ... and his response is hilarious.

Pro gaming legend Ninja says he's not going out like Antoine Walker -- telling TMZ Sports he's saving every penny of the FORTUNE he's making playing video games so he doesn't end up broke.

Ninja is considered the best Fortnite player on the planet -- and rumor has it he's making around $500k PER MONTH murdering people at Tilted Towers and Paradise Palms.

So, when we saw him out in L.A. this week, we asked what he's doing with all that cash -- and it's clear he's learned from Nic Cage's insane spending mistakes.

"We've been very smart with [our money] and just kind of saving it until we eactly know how we want to move forward," Ninja told us.

"Nothing lasts forever, and we're making sure that we're taken care of."

Post Malone is taking sides in the Logan Paul-KSI boxing match ... and Logan ain't going to like this ...

The "Better Now" rapper says he's got KSI in the superfight ... telling TMZ Sports if he had to be in one boxer's entourage for the August 25 tilt in England, he's siding with the smaller dude.

"KSI looks tough," Post says. "He's tough. He's undefeated!"

Post seems irked by the way Logan and his brother, Jake, came out for the mega-fight's press conference ... saying it all looked a lot like Conor McGregor.

Same last name ... but NO love between Logan Paul and "Breaking Bad" star Aaron Paul -- with Logan telling TMZ Sports he would beat Aaron's ass if they ever came face-to-face.

Their beef goes back a few months ... when Aaron trashed Logan for his video stunt gone wrong in the suicide forest in Japan. Aaron told Logan to "go rot in hell."

Now, Logan is firing back ... calling Aaron an "Internet bully" -- and warning the actor that if he REALLY wants a piece, he'll end up getting hurt.

Logan Paul and Chloe Bennett just made their big couple debut in public, and their fans -- okay, mostly Logan's -- were all about capturing the moment.

The YouTube star and the "Agents of S.H.I.E.L.D." star have been rumored to be an item for a while, but confirmed it Thursday when we saw them out together in Beverly Hills ... with a high five.

Check it out -- the 2 were swarmed by fans while our guy asked them questions about their relationship ... like how they're dealing with some fan disapproval, and what Chloe's favorite present from Logan is so far.

Chloe made it clear she was dating Paul Wednesday when she responded to a fan's tweet asking why she'd be with him buy saying ... "He's changed my life for the better and I've done the same for him."

Logan responded by joking he hadn't confirmed anything, but "would be an extremely lucky young man" if he had the chance to date Chloe. Clearly, he had the chance and seized it ... but he tells us he understands why some of her fans would be against dating him.

UFC welterweight champ Tyron Woodley says he's already punched his ticket to be a UFC Hall of Famer ... but when it comes to Nate Diaz, the man from Stockton ain't exactly a lock.

Woodley broke it down on "The Hollywood Beatdown" -- explaining why he deserves to join MMA greats like Chuck Liddell, Royce Gracie, Ken Shamrock and Ronda Rousey.

So, why not Nate Diaz? Tyron says his resume ain't that impressive -- and if he wants to add "HOF" next to his name, he needs to chalk up a few more MAJOR wins.

Woodley also weighed in on the Hall of Fame chances for Jon Jones, Brock Lesnar, Daniel Cormier and Nick Diaz.

There's more ... Woodley also reveals his favorite story about his old friend, Kimbo Slice, and why he's super excited for the upcoming movie about the late MMA star.

Logan Paul is adding EVEN MORE fuel to his rivalry with KSI ahead of their monster August fight ... saying straight-up the YouTube star is "my bitch!!"

Paul was out shopping on Rodeo Drive and was asked if he was ready to take on KSI in their upcoming superfight in England.

And, as has been the case at a nightclub ... on the streets of West Hollywood ... and at their news conference ... Paul took another shot at the social media superstar.

"He's my bitch -- of course."

A group of fans that had gathered to see Paul loved the comment ... and started a "Screw KSI!" chant -- which Logan just had to film.

Logan Paul says his beef with KSI is 100% real -- telling TMZ Sports he "hates" the YouTube star, and says he's calling his shot in their upcoming boxing match.

Logan and KSI came face-to-face during a heated news conference this past weekend -- things got physical ... and Logan is adamant the hatred ain't just to sell tickets.

"It's real beef," Paul told us on the way out of Catch in West Hollywood ... "I hate the kid."

The two will fight for real in August when they square off in Manchester -- but, for now, it's gonna be a LOT of trash talk.

"I'm fighting a sack of potatoes. KSI, you suck."

Paul says the fight isn't just a big moment for YouTube stars who want to show they're bigger than social media -- it could also be a HUGE moment for the sport of boxing.

Logan Paul says his battle with KSI is gonna be a critical one ... because he plans to put his YouTube foe in the hospital.

We got Logan just a few minutes before he and KSI nearly came to blows at an L.A. nightclub earlier this week ... and when asked which hospital he was gonna put KSI in -- he didn't back away.

"I don't really know the L.A. hospitals, but I feel like he's gonna make rounds to all of them."

What's he gonna do AFTER he checks KSI in? We asked if it involved partying with Floyd Mayweather and, guess what ... IT DOES.

"You got to [celebrate with Floyd], bro," Logan told TMZ Sports.

"I trained at his gym, that was my first training session. So, I feel like it's only right."

The thing is ... KSI's also been in Floyd's TMT gym in Vegas -- with Floyd's pops giving him firsthand lessons ... so, either way, it looks like Floyd will get some turn-up.

Dude just can't lose.

Tyron Woodley has gone from wanting to murder Conor McGregor -- to being his biggest supporter -- and he's revealing the REAL reason he's rooting for the Irish star to beat his felony bus attack case.

Remember, the two nearly came to blows back in 2016 during a backstage altercation at the UFC 205 weigh-ins. It got bad.

But now, Tyron says ... he wants to be connected to Conor in a big way -- and kept it 100 on "The Hollywood Beatdown."

There's more ... Tyron also explains why he wants to end Colby Covington's life -- and makes the guy a REAL offer he hopes the UFC fighter can't refuse.

Plus, Woodley goes after Tekashi69 and breaks some news about his rap career.