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Conor McGregor believes he's got all the advantages in a fight with Floyd Mayweather -- power, reach and youth ... saying, "Age waits for no man!"

McGregor talked about his possible boxing career during an event in Northern Ireland on Friday -- when, of course, the topic of Mayweather came up.

"If I focus with the work ethic I have solely on the sport of boxing, there’s no telling what I could do,” McGregor said.

"I would not go in there just to show up, I’d go in there to knock [Floyd] out. That’s it. He can be hit, he’s been hit before. Age waits for no man."

"I know the size is on my side, I know the reach is on my side, I know the youth is on my side."

He continued, "There’s a lot to lose for them, so that’s why they're scrambling ... but that’s okay, I’ll leave them scrambling. I’ve got some other boxing opportunities and potential opponents in mind. Some previous Floyd opponents. They can bring in anyone in the game. We’ll see what happens."

Someone brought up boxing champ Paul Malignaggi -- who called McGregor out on social media.

Conor's response? WHO THE F**K IS THAT GUY?!!

Here's LeBron James hilariously proving he's a man of his word ... even when he's a loser.

Bron lost his World Series bet with Dwyane Wade (Cleveland vs. Chicago) ... and agreed to wear a Chicago Cubs jersey to pay it off.

Question ... where the hell did they find a jersey big enough to fit this guy?

Good on you, LeBron. There's always next year ...

WWE legend Jimmy "Superfly" Snuka is in bad shape ... with his doctor claiming his stomach cancer is terminal and he only has 6 months to live.

73-year-old Snuka Skype'd into a court hearing in his murder case from his hospice in Florida -- and during the hearing, his doctor dropped the bombshell about his health.

Snuka's doctor said he's been suffering from a bunch of infections and his prognosis isn't good.

As for the murder case, Snuka is accused of killing his then-girlfriend, Nancy Argentino, back in 1983.

The judge had previously declared Snuka not mentally competent to stand trial. Friday's hearing was an update to see if his mental state had changed ... but no official decision was made.

2:40 PM PT -- Cops say they have detained a man they believe to be the shooter -- 54-year-old Ronald Gasser.

Cops say McKnight did NOT have a gun at the time of the shooting.

Emergency responders tried to administer CPR but to no avail.

Ex-NFL running back Joe McKnight was murdered in a road rage shooting in the New Orleans area ... law enforcement tells TMZ Sports.

The incident occurred at 2:43 PM. Family members identified the 28-year-old at the scene.

A witness told NOLA.com ... she saw McKnight trying to apologize to another man after some sort of traffic incident.

The witness says the man then pulled out a gun and shot McKnight -- and while standing over him screamed, "I told you not to f*** with me" ... then fired another shot into his body.

McKnight was a high school phenom -- considered the best running back in the country.

He played college ball at USC. He was drafted by the NY Jets in 2010.

In a statement to TMZ Sports, the Jets said, "Joe McKnight was a loving father and a genuine, kind-hearted person. It is sad when life is taken in what appears to be such a senseless act of violence. Joe you will be missed."

Joe was currently playing for the Saskatchewan Roughriders in the Canadian Football League.

Roughriders president and CEO Craig Reynolds issued a statement saying, "We are saddened to hear of the tragic loss of Joe McKnight."

"Losing a member of our Rider family this way is an unthinkable occurrence. Our thoughts and prayers are with Joe’s family, teammates and coaches."

If NASCAR star Jimmie Johnson wins a record-setting 8th championship next year ... he'll be spraying Monster Energy drinks instead of champagne.

Chad Johnson was straight fire during a lecture at the University of Florida Thursday morning -- blazing up a cigar in the middle of class ... despite the fact it's a non-smoking campus!!

The ex-NFL star was the guest speaker at a sports media class on the UF campus -- and cracked jokes about all sorts of stuff ... including his ever-changing last name.

But Chad got the most laughs when he pulled out his stogie -- and actually began to smoke it during the class!!!

FYI, UF has touted itself as a tobacco-free campus since 2010 ... but if you think a little rule is gonna stop Ochocinco ... child, please.

Thousands of emotional fans packed the Arena Conda stadium in Chapeco, Brazil Wednesday night to pay tribute to the soccer players killed in the Colombia plane crash ... with flags, drums and fireworks.

71 people were killed -- including most of the Chapecoense Real soccer team -- when their flight crashed into the mountains in northwestern Colombia earlier this week.

The tribute at the team's home stadium was beautiful.

R.I.P.

Iman Shumpert says he would boycott Donald Trump's White House if the Cavs repeat as NBA champs and are invited back to 1600 Pennsylvania.

The Cavs star was speaking with Complex when he was asked if he would boycott Yeezys after Kanye West expressed support for the President-elect.

"I understand people’s stance on Trump. I can’t get caught up in the racial, sexist bulls**t he’s got going on. That’s his personal thing, ya dig."

He added, "I do think he’s crazy -- straight up."

Complex followed up with the White House question:

Complex: "Will you go to Trump’s White House if the Cavs win the championship again this year?

Iman: "I’m not going to the White House."

Talk about determination ...

Lindsey Vonn broke her arm just over 2 weeks ago ... and she's already back in the gym working out like the freak athlete she is.

Vonn fractured her humerus while training in Copper, Colorado ... but it's hard to tell in the video she just posted on Instagram.

The world-class skier provided an update Wednesday, proving that she's not gonna let a broken arm keep her from getting in a few pull ups.

UFC superstar Nick Diaz says he's the "face of weed for athletes" ... and isn't afraid to admit it.

In fact, Diaz says he's the "Number 1 athletic stoner besides Michael Phelps."

Diaz -- who's tested positive for weed on several occasions -- appeared on "The Jasta Show" and explained why athletes should be ALLOWED to smoke marijuana ... especially after a fight.

You gotta listen to Diaz explain it ... but essentially says he relies on weed to get his head right ... especially after he's been knocked out and he's discombobulated.

Diaz admits weed can be performance enhancing ... but no more so than vitamins.

There's also this ... Nick says his brother, Nate Diaz, was NOT smoking CBD oil after his UFC 202 loss to Conor McGregor -- he was blazing up good ol' fashioned weed.

The man who created McDonald's most iconic burger has gone to the big burger stand in the sky.

Michael "Jim" Delligatti, who made the first Big Mac, died in his home in Pittsburgh Monday night surrounded by family ... according to a McDonald's spokesperson.

Delligatti, who owned multiple McDonald's franchises in Pennsylvania, first thought of the Big Mac in the mid-1960s ... when he wanted to offer customers a bigger burger than what Mickey D's was offering at the time. McDonald's was reportedly opposed at first, but the burger gods ended up going with his idea in 1968. It was already a hit at all of his stores in PA.

Delligatti was 98. In case you forgot his invention inspired that awesome jingle.

Sorry, you're gonna be singing this all day.

Here's Greg Hardy looking blue during a court hearing in Dallas Wednesday ... where he's facing a cocaine charge stemming from a Sept. arrest.

Nothing big happened inside the courtroom -- the hearing was kicked to Dec. 19 -- but outside, Hardy's attorneys hinted at his possible defense ... saying footage of the arrest is disturbing, according to FOX 4.

As we previously reported, Hardy was arrested on Sept. 25 and charged with 1 count of felony possession of a controlled substance ... after cops say they found coke in his wallet.

Snoop Dogg is pulling NO PUNCHES -- siding with Eric Dickerson in his war against the L.A. Rams ... and calling for the team to fire "sorry as f**k" head coach Jeff Fisher.

The rap legend just went off -- saying the Rams are disgraceful for allowing Fisher to unofficially ban E.D. from the sidelines while allowing celebrities like himself and Britney Spears to roam free.

He called Dickerson a legend and says he deserves all access to the team -- FOREVER -- and should be allowed to criticize the organization because he's earned the right.

Melania Trump just got what she wanted -- a retraction from the YouTuber who posted a video suggesting her son, Barron, might be autistic.

The guy behind the video now says, "It was incredibly irresponsible of me to diagnose Barron Trump using a selection of misleading videos. I falsely correlated him trying to stay awake and occasionally doing quirky things, with him suffering from autism."

TMZ broke the story ... Melania hired high-powered attorney Charles Harder to fire off a letter threatening to sue the YouTuber -- whose video blew up after Rosie O'Donnell tweeted the link with the caption, "Barron Trump Autistic?"

He also admits the video -- which has been deleted -- was "false, defamatory and malicious." The apology goes even further, and seems extremely genuine and heartfelt.

It wasn't passing on Johnny Manziel ... it wasn't the Greg Hardy situation -- Dallas Cowboys bigwig Stephen Jones says the hardest decision he's made in the front office is benching Tony Romo.

Stephen -- the Cowboys CEO and Director of Player Personnel (and also Jerry's son) -- did a video Q&A with fans moments ago ... and was asked to name the most difficult Cowboys decision he's had to make.

Without hesitation, Stephen explained why forcing Tony to take a back seat to Dak Prescott was especially tough for him.

By the way, he did the interview with a painting of Tony Romo over his left shoulder.

Jones keeps referencing Dak's "hot hand" -- which makes it seem like he's ready to turn right back to Tony if that hand happens to cool off.

Also, interesting Stephen is taking credit for the move ... and not head coach Jason Garrett.

Looks like the band isn't getting back together just yet ... 'cause Charles Barkley says his chilly friendship with Michael Jordan hasn't been re-warmed after all.

Barkley appeared on "The Dan Le Batard Show with Stu Gotz" on ESPN radio and spilled some Hall Of Fame tea ... saying the picture of him and Michael side hugging last month was nothing more than a photo op.

"We just happened to be at the same place at the same time. I love him like a brother but we are not back to where we used to be."

The third man in the photo, Kenny Smith, had told TMZ Sports Barkley and Jordan did in fact bury the hatchet that day ... but clearly, it ain't that buried.

As for the origin of the beef, Barkley says Michael got upset at criticisms CB made publicly about MJ's performance as the chairman of the Charlotte Hornets.

Barkley says he misses his friend -- but he's a professional analyst and won't apologize for doing his job.