Postpublished at 05:51 British Summer Time 27 August 2017
"Calm down, you just need to tie him up this round," says McGregor's coach John Kavanagh.
BBC 5 live's Steve Bunce adds: "He's got nothing left but heart and guts."
How long can he hang on?
Summary
Floyd Mayweather stops Conor McGregor in 10th round
Floyd Mayweather has now won all 50 of his professional fights
Wales' Nathan Cleverly loses his WBA light-heavyweight title v Badou Jack with fifth round stoppage defeat
GB's Savannah Marshall wins her first professional bout with a unanimous points decision
Get involved #bbcboxing
Postpublished at 05:51 British Summer Time 27 August 2017
Postpublished at 05:50 British Summer Time 27 August 2017
Round 9: Mayweather v McGregor
A wild, hopeful swing from McGregor, but it misses by miles. McGregor is one tough customer as Mayweather lands a lot in round nine but cannot finish it and McGregor is gasping for air at the end of the ninth.
Three rounds for him to turn this around and cause the shock of all shocks.
Postpublished at 05:48 British Summer Time 27 August 2017
Round 9: Mayweather v McGregor
Mayweather lands with a straight right, McGregor has to hold on, desperately.
Postpublished at 05:48 British Summer Time 27 August 2017
Round 9: Mayweather v McGregor
Mayweather attacks, McGregor backed into the corner.
Postpublished at 05:47 British Summer Time 27 August 2017
Round 9: Mayweather v McGregor
McGregor throws out a jab as the pair were separated by the referee Robert Byrd. It comes after one shot which Mayweather thought was low.
Mayweather does not seem concerned with his opponent's power though.
Postpublished at 05:45 British Summer Time 27 August 2017
Round 8: Mayweather v McGregor
McGregor looks like a man whose energy has been sapped out of him, and his punches do not cause even a flinch of pain from Mayweather, who is toying with his opponent at the moment.
One punch can change everything though.
'Completely shocked the boxing world'published at 05:43 British Summer Time 27 August 2017
Round 7: Mayweather v McGregor
Steve Bunce
BBC Radio 5 live boxing pundit in Las VegasI hope nobody takes anything away from Conor McGregor in these seven rounds. He's completely shocked the boxing world like he said he would.
Postpublished at 05:42 British Summer Time 27 August 2017
Round 7: Mayweather v McGregor
McGregor has a cut on the mouth, and needs to do something to get himself back into the contest. Mayweather is looking too good, and McGregor's punches are not looking powerful enough to cause any damage.
But he is still in there, so deserves a huge amount of credit for that. Seven rounds gone.
Image source, ReutersPostpublished at 05:41 British Summer Time 27 August 2017
Round 7: Mayweather v McGregor
A powerful right rocks McGregor's head back, the experience of Mayweather is proving critical. The Irishman is starting to look on borrowed time here.
Postpublished at 05:39 British Summer Time 27 August 2017
Round 7: Mayweather v McGregor
Our vote earlier asked what would happen and 36% said Mayweather to win inside the first six rounds. That was the most popular option, but has not happened.
Into round seven. McGregor needs a good one after losing the momentum he had gained at the start.
Image source, Getty Images'Mayweather pressure'published at 05:37 British Summer Time 27 August 2017
Round 6: Mayweather v McGregor
Lennox Lewis thinks Floyd Mayweather is taking control.
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End of twitter postPostpublished at 05:37 British Summer Time 27 August 2017
Round 6: Mayweather v McGregor
Mayweather ducks, dives and is proving, as he has throughout his career, extremely hard to hit. This is looking like a potential turning point, Mayweather starting to turn the screw.
Postpublished at 05:35 British Summer Time 27 August 2017
Round 6: Mayweather v McGregor
Into round six, how many thought it would go this far? Mayweather is starting to land, heavy, heavy punches.
Postpublished at 05:35 British Summer Time 27 August 2017
Former tennis player Andy Roddick is loving the action.
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End of twitter postPostpublished at 05:34 British Summer Time 27 August 2017
Michael Page
MMA star for BBC Radio 5 live in Las VegasWe just saw Mayweather get into McGregor's head. Floyd is pushing him and McGregor looks extremely tired.
Image source, ReutersPostpublished at 05:33 British Summer Time 27 August 2017
Round 5: Mayweather v McGregor
The busier work is still coming from McGregor, but none of the punches are taking effect and none of them are causing damage. A big left from Floyd Mayweather does find its mark though.
Things get feisty at the end of round five, with Mayweather shoving McGregor out of his way. Warming up nicely.
get involved Get Involved - Your thoughts on the actionpublished at 05:31 British Summer Time 27 August 2017
#bbcboxing
Andrew Priestley: Can't help but feel that Floyd Mayweather might just be toying with Conor McGregor here. Tire him out and unload later on?
'We've never seen Mayweather like this'published at 05:30 British Summer Time 27 August 2017
Round 4: Mayweather v McGregor
Steve Bunce
BBC Radio 5 live boxing pundit in Las VegasHow about this? Floyd Mayweather is struggling. Both men look like they're breathing heavy. We've never seen Floyd Mayweather like this. He's looking for a single shot.
Image source, ReutersPostpublished at 05:30 British Summer Time 27 August 2017
Round 4: Mayweather v McGregor
McGregor opts to utilise his own body punches, twice burying lefts deep into the American's chest, but wait, Mayweather lands again, with a left cross, at the end of that round. His best work of the fight so far? Is McGregor in danger of punching himself out early?
Postpublished at 05:28 British Summer Time 27 August 2017
Round 4: Mayweather v McGregor
Mayweather produces some of his best work early in round four. A straight right to the body and another to the chin both find their target.