Talk about getting smashed up ... UFC fighter Devin Clark is going to be spending LOTS of time in the dentist's chair this week, because his teeth are a mess after losing a fight.

It's pretty gruesome ... Clark went the full distance against Ion Cutelaba, but it wasn't easy.  Clark was pummeled the first 2 rounds, and that appears to be when the damage was done.  Cutelaba smashed in the bottom row of Clark's teeth.

The fight, at the UFC Apex in Vegas Saturday night, almost ended after round 2. Clark told his corner his teeth were messed up and there was talk about throwing in the towel, but he came out for the third and final round.

Things got even worse in round 3 when Cutelaba bashed Smith's head into the canvas.

The decision was unanimous in favor of Cutelaba.

"Crazy that after 17 years we're back in it, we're still in the mix, fighting on a big card. All the fans are excited, so its nice to go out there and put on a show for the fans."

That's Robbie Lawler telling TMZ Sports about fighting Nick Diaz ... 6,386 days after first battling his fellow MMA legend at UFC 47 (we're at 266 now).

FYI, Lawler lost by knockout in the 2nd round.

We asked 39-year-old Lawler whether there's anything he can take from the 2004 fight ... but Ruthless Robbie said the fight happened just too damn long ago.

"Not too much [to learn], 'cause I mean I've evolved so much from that fight, learned so much from that."

To make prep even harder for Lawler ... 38-year-old Diaz hasn't fought since his no contest against Anderson Silva at UFC 183 in 2015.

But, Lawler doesn't expect a rusty or run-down Nick ... he believes he'll get a prime version of the fighter from Stockton, Cali.

As for Lawler's future (he's lost his last 4 against guys like Colby Covington and Rafael dos Anjos), we asked him if it's possible next Saturday will be the last time we ever see him in a UFC Octagon.

"Nah, it's not possible. I've been doing this for a long time. My body feels good. Just waiting for good fights that get me excited, and this is one of those fights. Nick Diaz is a big name, and this is gonna be a big event."

Oscar De La Hoya is obviously feeling great after his COVID hospital stay -- some 7 days after the fact, he was putting his lungs to good use ... with some movie-themed karaoke.

The boxing champ was out in Pasadena this past Wednesday, hitting a place called the Der Wolf bar for some evening time show tunes ... where he got on the mic to sing "Shallow" -- yes, the Lady Gaga song from "A Star is Born."

In video obtained by TMZ, you can see ODLH reading lyrics off the monitor and belting out the second verse (Gaga's part) ... with bar-goers enthusiastically helping him out. Seems like a crowd favorite! He flubs a bit as he goes along -- but carries on nicely regardless.

It's a 180 from how Oscar was doing just a week and change prior -- when he was hospitalized for a handful of days for a nasty bout with COVID ... which prevented him from fighting Vitor Belfort, and requiring Evander Holyfield to step in (and get TKO'd).

Clearly, Oscar's doing great after that ... and maybe this outing means he'll get back in the ring sooner than later. Assuming he doesn't get sick again, that is, in a mask-less environment (like this).

Logan Paul has clearly been benched from boxing because we just got this pic of him in Europe with a busted hand.

Logan was at the airport in Berlin Saturday, on his way to Reykjavik, Iceland. His right arm was covered in blue Plaster of Paris. An eyewitness says when he got on the plane he was posing with a large stuffed penguin and a footlong golden egg.

Logan doesn't have his next match scheduled, so he'll have time to heal. We don't know how it happened, the extent of the injury or the timeline for recovery, but it's definitely a problem. Logan, BTW, is a right-handed fighter.

Now it's always possible this is a stunt -- it's half the Paul Bros for cryin' out loud -- but this seems like the real deal.

Almost 3 years after badly losing to Max Holloway, Brian Ortega is back, fighting for the UFC's featherweight title against Alex Volkanovski ... and if he wins, T-City has revenge on his mind.

TMZ Sports talked to 30-year-old Ortega -- the #2 ranked 145-pounder in the UFC -- just days before he headlines UFC 266 against Volkanovski.

Brian is a slight underdog ... but most expect a very close fight. And, if he wins the strap ... Ortega knows who he wants next.

"[Fighting Max Holloway] would be ideal. I'm not trying to speak ahead, nor am I trying to get past Volkanovski, right, cause he beat Max twice," Ortega told us.

T-City continued ... "I'm not here to say I'm already celebrating. But, that would be ideal. I'm a better person, better fighter than I was when I fought him. And, watching his last fight, so is he."

"You always want that as a fighter, as a competitor, you always want that, to make that s**t square. Or to say, 'Yo dog, you legit got the best of me. Good s**t."

You may remember ... Ortega lost to Max via doctor's stoppage in the 4th round at UFC 231 in 2018. Brian, who kept coming forward despite eating an ungodly amount of punches (and breaking his hand, dislocating his thumb, among other injuries), would not quit.

Brian took almost 2 years to heal up ... but once he did, he looked fantastic in the Octagon, toying with Chan Sung Jung a.k.a. the Korean Zombie in October 2020.

Ortega admits he looks at the 1 blemish on his otherwise perfect resume (15-1) ... and it ticks him off.

"I'm competitive. I want to make s**t even. It does bother me."

Bottom line ... "Even if he f**ks me up again, or whatever. I'll fight you 100 times. I'm gonna get one."

UFC fighter Ryan Spann trains at the gym owned by ex-NBA star Deron Williams ... and the light heavyweight contender once sparred with the hooper -- AND GOT HIS BUTT KICKED!!

"Deron whooped my ass one day. I'm dead serious. You can call him and ask him," Spann told TMZ Sports.

Context? We talked to the 30-year-old, 6'5", 205 lb. fighter just days before he's set to face 6th ranked LHW, Anthony Smith ... and we asked the 11th ranked fighter if he ever rolled around with 6'3" Williams at their gym, Fortis MMA in Dallas.

"I was training for a fight, and coach was like, 'Deron, get in.' And, I already knew he hooped, and I knew who he was, but I never got to go with him," Ryan said, "I think it was my 2nd or my 3rd round with a fresh body, and you put Deron in, I was like, 'Oh s**t, nice, I get a round off.' Little did I know Deron used to wrestle. And, he was about 230 at the time."

FYI, Williams was a damn good wrestler as a kid. Long before he starred at Illinois, was drafted with the 3rd overall pick, or made any All-NBA teams, Deron was a state champion on the mats in Texas. He won titles as an 8 and 12 year old ('93 & '97).

So, Ryan and the 3x NBA All-Star sparred. How'd it go?!

"It wasn't until Deron was on top of me and me struggling to get up, and coach gonna look at me and say 'I've been working with him for the last couple of years. You thought you were gonna get this round off?'"

Shocking, on the surface, considering Spann is one of the most dangerous men in the world ... meanwhile DW, surely a good wrestler as a kid and great athlete in general, is a basketball player -- not a fighter.

Then it was time for a little payback ... in the form of a knuckle sandwich.

"He got me, but the next round I hit him with the right hand and he hasn't sparred me since."

So, would Deron -- who's only 37-years-old and hasn't played ball professionally since he was with the Cleveland Cavs in 2017 -- ever take a real fight??

Ryan says Deron was once pitched a fight with Pro Bowl defensive lineman turned UFC fighter Greg Hardy (we actually talked to Deron about this in 2018) ... but unfortunately, the scrap never came together.

UFC fighter Dan Hooker's fight against Nasrat Haqparast is in serious jeopardy ... with the lightweight begging for a visa to make it to Vegas for UFC 266 next Saturday.

31-year-old Hooker -- who is from Auckland, New Zealand -- sent out a public cry for help to the U.S. Embassy’s Kevin Covert on Twitter on Thursday.

FYI -- Auckland is currently experiencing widespread COVID-19 outbreaks ... which has led the government to require folks to stay home and remain in bubbles.

Hooker tweeted at Covert in hopes of getting his situation handled ASAP ... saying, "Hi Kevin, apologies for messaging on here but it’s a last resort."

"My visa is with the US embassy here in NZ as I fight next week in Las Vegas on #UFC266 Update today is it won’t be approved until next week due to lock down which will cancel my fight. Please help."

"The embassy has my passport and all the completed documentation, all I need is it to be processed and returned," he added.

"This is an absolute last resort."

Hooker is slated to fight 26-year-old Haqparast --who is 5-2 since joining the UFC in 2017 -- on September 25.

Brian Ortega vs. Alex Volkanovski and Nick Diaz vs. Robbie Lawler are also on the card.

The embassy responded to Hooker's tweet by asking him to reach out to them directly ... so it seems they may be on the case.

Conor McGregor and MGK have no bad blood, according to The Notorious himself who says not only do the guys NOT have beef ... but the rock star is invited to his next UFC fight.

The 33-year-old UFC superstar was leaving his hotel in NYC ... when he was asked about the incident with Machine Gun Kelly at the MTV VMA's Sunday night in Brooklyn.

"I got to go to the Barclays Center again. I got to present an award. I was just going to have a good time, you know what I mean? That's it. All love, all love! It's all good," Conor told Adam Glyn.

That's when McGregor extended the invitation, saying ... "Come to the next fight and watch me perform any time. I perform, no problem. Everyone's more than welcome to come to my fights or come to the shows. No beef. I don't even know the guy."

Of course, Conor and MGK nearly came to blows on the red carpet of the award show ... with McGregor lunging at the musician and splashing a drink before being restrained by security.

Peace was eventually restored ... and McGregor presented an award to Justin Bieber at the show. MGK performed with Travis Barker.

But, the question still remains ... why the hell were they fighting?

Conor clearly didn't want to get into it ... but did drop this line before shifting topics.

"I don't know [MGK]. Who is he? Tellin' me he's been at the fights, Megan's been at the fights years, so I know Megan and then I don't know the guy. There's no problem. Come to the fights."

A dig? Possibly. Or, maybe he just ain't a fan of Kelz.

Conor also gave a health update (it's only been 66 days since he broke his leg) and it's going to be music to the ears of McGregor fans.

"I honestly feel like I could kick right now, but I just gotta listen to to the doctors, listen to the people that are guiding me. That's what I've done so far. I've committed myself to the work, and I'm back on the feet."

Vitor Belfort says he's about to be $30 MILLION richer ... that is, if Jake Paul has the guts to step in the boxing ring, telling TMZ Sports The Problem Child's a coward if he doesn't accept the fight.

"I'd like to teach that boy a lesson. Your parents give you behaviors and all that, so he's gonna meet his big daddy," 44-year-old Belfort says.

"And, if he likes money, we got big money. There's no excuse to run away from this fight. So, he has to take it, and if you don't take it, he's gonna show he's a coward and he's looking for easy fights."

Shots fired.

Paul's 4-0 professionally -- with wins over Tyron Woodley and Ben Askren -- but Belfort has zero doubt he'd knock out the YouTuber-turned-boxing star, saying ... "I'm gonna knock [Jake] out. There's no doubt about it."

Of course, Belfort called out 24-year-old Paul in the ring following his 1st round KO of Evander Holyfield ... with Triller's Ryan Kavanaugh pledging $30 million to the winner of the potential scrap.

$30 mil is A LOT of money, but what's unclear ... after signing a deal with Showtime Boxing, could Jake take the fight, even if he wanted to?

"I think it's worth it. $30 million to get your a** whooped by a legend like myself," Belfort says.

If not Jake, Vitor told us he's also interested in Canelo Alvarez (there's a $40 mil offer on the table from Triller), Wladimir and Vitali Klitschko, Lennox Lewis and even Tyson Fury.

As for Paul, he recently called out Jorge Masvidal ... but with Gambred under contract with the UFC, it's highly unlikely Dana White would sign off on the fight.

Derek Brunson admits he lost to Israel Adesanya, fair and square, but says he wasn't right before the 2018 fight -- his last loss -- and now he wants to run it back with Stylebender, promising a different result.

"I'm not gonna discredit Izzy. He did a great job in the first fight. But, after looking at the fights, my coaches were like, 'Are you okay? What's wrong? Cause that ain't you,'" 37-year-old Brunson tells TMZ Sports.

Derek says he couldn't train for 2 weeks before the Adesanya fight ... as he was dealing with a hurricane that disrupted his routine. The time away from the mats made DB rusty.

Brunson also says he stopped lifting weights in the lead-up to the fight ... in an effort to increase his cardio. However, Derek says the strategy backfired in the fight.

Bottom line, Israel won, but Brunson says that won't be the case next time.

Since takin' the L, Brunson's been on a rampage -- winning his last 5 fights -- with dubs over Edmen Shahbazyan (his 1st loss), Kevin Holland and Darren Till, in addition to 2 others.

Adesanya's likely going to fight Robert Whittaker later this year or the beginning of next year.

Jason "Mayhem" Miller, troubled ex-MMA fighter, was arrested for felony domestic violence in L.A. ... after allegedly getting physical with a woman, TMZ Sports has learned.

40-year-old Miller was taken to jail ... and his bail has been set at a whopping $1.385 million.

He is still currently in custody.

Our law enforcement sources tell us cops in the San Fernando Valley received an emergency call before 3 AM Friday morning ... made by a female who was screaming on the phone.

Police -- lights and sirens blaring -- raced to the scene code 3 ... and found the female caller with visible marks on her face and neck.

At that point, cops *attempted* to arrest Miller inside the home ... but, he didn't cooperate.

A struggle ensued, and LAPD tased him.

Finally, police were able to cuff Miller ... and he was taken to the hospital to be checked out by doctors.

Miller was ultimately booked for felony domestic violence.

It's not the first time Mayhem's lived up to his name ... he's got a (very long) rap sheet.

In 2011, Miller was arrested for allegedly putting his sister in a headlock ... and refusing to release her.

Then in 2012, he was arrested for allegedly going into a church and spraying a fire extinguisher, before getting buck naked.

In 2015, Jason was locked up for allegedly trying to use a ceramic tile as a weapon against cops ... before being tased and arrested.

Good news ... Oscar De La Hoya was released from the hospital after a bad bout with COVID-19, the boxing legend announced on Wednesday.

"Hey guys, I am out of the hospital. I was in there for 3 days. COVID hit me really hard," ODLH said via social media, adding, "I was in the best shape of my life and I really can't wait to get back in the ring."

Of course, Oscar was scheduled to fight Vitor Belfort on September 11 ... but was forced out of the event when he contracted the virus.

It wasn't just a matter of Oscar being positive ... he was hit hard by the virus, forcing him to go to the hospital on Friday.

Oscar managed to film a video the same day from his hospital bed ... and it was clear he was in bad shape.

However, the Hall of Famer bounced back quick ... and is clearly on the med.

Unfortunately, De La Hoya's still out of his Saturday night fight with Belfort ... and fellow legend, Evander Holyfield has stepped in to fight the MMA legend.

If that wasn't enough ... former President Donald Trump -- who doesn't see eye-to-eye with ODLH -- will be doing commentary for the fight.

Bottom line, despite the setback, Oscar made it clear he still intends to return to the ring after a decade-plus layoff ... and he closed out his health update with a big shout-out to his millions of fans.

46-year-old Anderson Silva says he's got about 4 years of fighting left in him ... telling TMZ Sports his plan is to hang up the gloves before his 50th birthday.

Oh, and he's down to box Jake Paul!

Let's start with the YouTube star turned 4-0 boxer who just beat Tyron Woodley ... who's long been rumored as a possible opponent for the UFC legend.

"Everything is possible. Jake Paul and Logan are doing a lot of good work in this new entertaining show. We'll see. Everything is possible. I respect both. [Jake] is doing good, working hard. So, we'll see, maybe this is possible too."

Silva -- who's boxing Tito Ortiz on September 11 on Triller -- is only a few months removed from defeating 35-year-old former champion, Julio Cesar Chavez Jr. in the ring.

We also asked Spider about retirement ... and while it's clear the end isn't exactly imminent, it's definitely in sight.

"My goal is my last fight is 49 [years old]. 49, I'm done. Probably, I'm done. That is my goal. Fight 3 more years and done. 49. That's the number. Maybe I can fight more, but right now my goal is when I turn 49, I stop fighting."

Bottom line, Silva says he feels great and loves fighting, has more fights in him ... and one of those fights just might be against Jake Paul.

UFC fighter Daniel Rodriguez is fresh off a win over Kevin Lee ... but the L.A. native doesn't plan on sitting back and chilling -- he wants to fight, and he's got a name in mind.

TMZ Sports talked to the 34-year-old fighter who just cracked the welterweight division top 15 (he's ranked #15) ... and asked him who's next on the hit list, if he could call his shot.

"I think Belal Muhammad, I think like #9. I'm on the fast track," Rodriguez says.

And, D-Rod isn't concerned about being taken down by Belal ... 'cause he strongly believes his stand-up game is superior.

"At the end of the day, the fight starts on the feet, and that's my world."

FYI, 33-year-old Muhammad is coming off a unanimous decision win over Demian Maia in June.

Of course, Daniel is also coming off a big dub ... against Lee, who's no slouch. KL's beaten the likes of Edson Barboza, Michael Chiesa and Gregor Gillespie.

Most importantly, D-Rod -- who's fought 7 times in the last 18 months (6-1 during that time) -- says he wants to remain active, and anyone ranked above him can get it.

And, he doesn't plan on slowing down the breakneck pace ... 'cause Rodriguez says Kamaru Usman's belt is within his grasp.

Conor McGregor, Daniel Cormier and Amanda Nunes have held UFC titles in 2 divisions ... but a 3-division champ -- that's never been done -- at least not yet.

That's exactly what 28-year-old UFC star Darren Till tells TMZ Sports he's trying to do.

"For me, I’m chasing something totally different. I want to be great. I'm on a path to greatness and I'm a top contender. I want to be a champion in two divisions, maybe three. I know it sounds like I’m dreaming, but I’ve got to dream. That’s me."

18-3 Till, the #9-ranked UFC Middleweight (185 lbs.), has wins over big-name opponents like Kelvin Gastelum, Donald "Cowboy" Cerrone and Stephen Thompson.

DT has a big fight this weekend against #5-ranked Derek Brunson. The winner, with an impressive performance, could find themselves in prime position for a title fight against Israel Adesanya or Robert Whittaker (they're likely fighting in early 2022).

That's 1 division ... but there'd still be 2 left to conquer, Welterweight (170 lbs.) and Light Heavyweight (205 lbs.). A 35 pound difference is HUGE ... but Till, who's 6'0" tall, believes he can shed the pounds.

"I believe [I can do it]. I know I can do one last hoorah at 170 [lbs.] against the champ Kamaru Usman, and 205, but who knows. I’ve always dreamed of being a two-weight division world champion in the UFC."

"I know three is a stretch and I know I need to rack up a lot of wins but I'm a young kid dreaming."

In fact, Darren used to fight at welterweight ... but dropping the lbs. was brutal.

But, he thinks he can make the weight ... and when it comes to the actual fighting, Till doesn't think there are many people more dangerous in the Octagon.

The 1st step towards ruling 3 divisions starts this Saturday at UFC Fight Night.

Stay tuned ...