Mayweather dissects McGregor en route to 10th-round TKO

Floyd Mayweather def. Conor McGregor via 10th-round TKO

Round-by-round Coverage

ROUND 10: McGregor is desperately clinching, but Byrd isn't having any of it. Mayweather swarms him off the break and keeps swinging with the Irishman's back against the ropes until the third man in the ring has seen enough. Mayweather wins "The Money Fight" by 10th-round TKO and improves to a perfect 50-0.

ROUND 9: McGregor comes out swinging and cracks Mayweather with a shot to the body. He's running low on gas however, prompting Mayweather to go head hunting with his right hand, which he lands with ease as McGregor helplessly plods around the ring with his hands down. A strong statement from Mayweather in the most lopsided round of the fight.

ROUND 8: Despite his obvious fatigue, McGregor begins the stanza with a renewed sense of urgency. His left hand hits paydirt a few times, but Mayweather refuses to relinquish the reins, walking McGregor down and contentedly potshotting until round's end. Not much action, but "Money" remains in the driver's seat.

ROUND 7: Mayweather is no longer being bullied in the clinch and fearlessly puts McGregor on the back foot. A volume puncher, he is not, but his patented right straight is finding his foe's noggin at will. The UFC champ's much maligned gas tank has begun rearing its ugly head. Mayweather in control after seven.

ROUND 6: Mayweather pours it on to open the round as McGregor appears to have tired. The Irishman laughs him off, but the seasoned boxer may have finally found his range and begun turning the tables in a nailbiter - while standing in the pocket, no less. The fighters could very well be even on the judges' scorecards at the halfway mark.

ROUND 5: Byrd warns McGregor once more for his efforts to bully a fairly elusive Mayweather. The 40-year-old begins to press forward, and while a telling blow has yet to be produced by either side, he manages to crack McGregor with a straight right before shoving McGregor to cap the round.

ROUND 4: Mayweather finally lets his hands fly, the punches finding their home at will. "Money" rides his head movement to keep McGregor from landing anything cleanly for the bulk of the frame, although the Irishman feeds him a few shots to the body to close it out. Easily the closest round of the contest thus far.

ROUND 3: Byrd issues McGregor another warning for hitting Mayweather in the back of the head. McGregor continues to dictate the pace and pops the career pugilist's head back with a jab. Mayweather remains unfazed at round's end despite his negligible output.

ROUND 2: McGregor once again backs a passive Mayweather into a corner, only for referee Robert Byrd to break them up when the UFC champ throws a hammerfist. The Irishman aims to bully the defensive whiz, but Byrd is having none of his clinch attempts. As in the first, Mayweather throws very little, all but giving the round away.

ROUND 1: Mayweather allows McGregor to back him against the ropes and let his mitts fly. The fighters take the center of the ring before long, with Mayweather throwing little while the Irishman stalks and lands little of consequence. The UFC champ's initiative wins him his first round as a pro boxer.

12:13 AM ET

It's time.

12:08 AM ET

Mayweather waltzes over to his old stomping ground for the 50th time:

12:06 AM ET

"The Notorious" makes his way to the ring for his professional boxing debut - both UFC belts in tow:

11:56 PM ET

The gloves are on. National anthems are about to be sung. We're nearly there.

11:47 PM ET

SHOWTIME Sports confirms the main event will be delayed due to overwhelming demand for the pay-per-view until providers can process the requests.

11:39 PM ET

Even McGregor's bitter rival, Nate Diaz, had to witness the spectacle in person:

Undercard Results

11:36 PM ET

• IBF Junior Lightweight Championship Bout: Gervonta Davis def. Francisco Fonseca via 8th-round KO

Davis drops Fonseca with a left hand that appeared to have hit him in the back of the head before pushing him to the canvas in the eighth round. The referee waives the fight off after Fonseca is unable to answer the 10 count, making Davis the winner by KO just 39 seconds in.

The Mayweather protege maintains the fight-ending blow was legal, but Fonseca disagrees and calls for a rematch.

The IBF junior lightweight crown remains vacant, after Davis was stripped of his title Friday after not making weight.

11:27 PM ET

Davis' output has taken a back seat to his showboating, allowing Fonseca to work the body and get back in the fight. Sixth of 12 rounds about to begin.

11:13 PM ET

The main event will be delayed due to pay-per-view outages caused by overwhelming demand, according to Sal Paolantonio of ESPN.

Meanwhile, Davis is outclassing Fonseca four rounds into the co-headliner.

11:08 PM ET

The bill's co-headliner is finally underway:

11:00 PM ET

Where Conor McGregor goes, "Mystic Mac" goes: "I see me truly outclassing this man, and putting him to sleep."

10:58 PM ET

LeBron James makes his way to ringside:

10:54 PM ET

Still one fight to go before the main event. 11:15 start time highly unlikely.

10:51 PM ET

10:38 PM ET

10:35 PM ET

• WBA "Regular" Light Heavyweight Championship Bout: Badou Jack def. Nathan Cleverly via 5th-round TKO

Cleverly eats a barrage of unanswered punches while backed against the ropes and referee Tony Weeks steps in for the save 2:47 into Round 5. Badou Jack is the new WBA light heavyweight champion.

10:31 PM ET

Jack's stellar body work beginning to pay off after four rounds:

10:19 PM ET

No feeling out process for Jack and Cleverly. Both fighters trading leather early and often:

10:11 PM ET

A freshly coiffed Conor McGregor is in the building:

10:03 PM ET

Indeed it is:

9:59 PM ET

A lopsided win for The Money Team's Tabiti in the pay-per-view's opener:

• Cruiserweight Bout: Andrew Tabiti def. Steve Cunningham via unanimous decision (97-93, 97-93, 100-90)

9:42 PM ET

Floyd "Money" Mayweather has arrived at T-Mobile Arena:

9:39 PM ET

Mayweather tipped the scales at 149.5 pounds during Friday's weigh-ins, McGregor at 153:

9:30 PM ET

Four rounds into Tabiti vs. Cunningham:

Fight night's first celebrity sightings ...

9:00 PM ET

• Welterweight Bout: Yordenis Ugas def. Thomas Dulorme via 10-round unanimous decision (94-91, 93-92, 93-92)

8:47 PM ET

8:45 PM ET

8:43 PM ET

8:22 PM ET

7:56 PM ET

• Welterweight Bout: Juan Heraldez def. Jose Miguel Borrego via 10-round unanimous decision (96-93, 97-92, 97-92)

7:41 PM ET

Still not much of a turnout ...

• Super Middleweight Bout: Antonio Hernandez def. Kevin Newman via six-round unanimous decision (57-57, 59-54, 59-54)
• Super Middleweight Bout: Savannah Marshall def. Sydney LeBlanc via four-round unanimous decision (40-36, 40-36, 40-36)

5:51 PM ET