The Crumlin debutant took on the legendary Floyd Mayweather at the T-Mobile Arena. McGregor was stopped standing in the tenth round of the light middleweight twelve rounders.
Read a selection of the tweets from boxing people around the globe below.
Respect to McGregor for taking a chance but congrats to Floyd on #50!
— Manny Pacquiao (@mannypacquiao) August 27, 2017
Conner kept it interesting but he was outboxed and outclassed in the square ring. Nothing to be ashamed of tho. I like him even more now!
— Lennox Lewis (@LennoxLewis) August 27, 2017
Mayweather with the stoppage. McGregor showing us what we already knew, he's a tough, tough man.
— Frank Buglioni (@FrankBuglioni) August 27, 2017
McGregor unbelievable never gone 10 round before impossible he made a fight hurt Mayweather too https://t.co/62g68fg3xf
— George Foreman (@GeorgeForeman) August 27, 2017
Damn good fight. Mayweather put on a hell of a show. Conor did much better than I had expected. Hats off to both guys. Worth the money
— Shane Mosley (@ShaneMosley_) August 27, 2017
— Lou DiBella (@loudibella) August 27, 2017
Give mcgregor his due. Had a go, was always gonna be that result. Crazy how mcgregor ties so quick for some one who's so fit an trains hard
— Liam Smith (@LiamBeefySmith) August 27, 2017
Although one fighter who has his own superfight coming up was less than complimentary
— Canelo Alvarez (@Canelo) August 27, 2017
McGregor’s fellow Irish fighters gave ‘The Notorious’ credit.
We all know he can fight but if he can learn to adapt to 12 rounds Conor will be a very good boxer. A lot of millions richer. Happy days
— Carl Frampton MBE (@RealCFrampton) August 27, 2017
— Katie Taylor (@KatieTaylor) August 27, 2017
— Michael Conlan (@mickconlan11) August 27, 2017
Mcgregor did extremely well! Fair play
— Tommy McCarthy (@Tommymac90) August 27, 2017
And the over 40s club continues mayweather v mc gregor
Fairplay to conor the @TheNotoriousMMA showed great heart
— Martin Rogan Ireland (@BigRogie) August 27, 2017
#McGregor done himself proud yet again tonight. Did well and comes out rich healthy & wise & conducted himself really well up the Irish ☘
— Gary Spike OSullivan (@spike_osullivan) August 27, 2017
— Jason Quigley (@jay_quigley) August 27, 2017
Fair play to McGregor!
— Eamonn O'Kane (@KingKane11) August 27, 2017
Great effort tonight #MayweaterMcGregor it was what it was.
— Kenneth Egan (@kenegan30) August 27, 2017
Went out on his shield.. could have easily got himself DQ but stayed with Queensbury rules. Good stoppage from the ref.
— Shane McGuigan (@McGuigans_Gym) August 27, 2017
— Patrick Hyland (@Pajpunisher) August 27, 2017
I tip my hat to Conor McGregor he done far better than I ever thought he would. And still standing at the end! #MayweathervMcgregor
— Eric Donovan (@eric_donovan60) August 27, 2017
Mcgregor can hold his head high boxing is a different gravy!
— The Rook Dalton (@TheDaltonator90) August 27, 2017
Only the dreamers thought McGregor would win.. most of them who never did a combat sport in their life. Hats off to Conor for having a go!
— Adam Nolan (@AdamNolan12) August 27, 2017
Mcgregor blocking punches with his face was wonderful.
— Lewis Crocker (@lewiscrocker1) August 27, 2017
Fair play to McGregor 1 of the biggest fights in history was made tonight but boxing would always have won..Gr8 2 watch 50-0 Mr Moneymay
— Alanna Nihell (@MrsANihell) August 27, 2017