McGregor, 28, crosses disciplines from mixed martial arts in the Ultimate Fighting Championship (UFC) to take on undefeated 40-year-old boxing legend Mayweather. The pay-per-view event, scheduled for August 26, will air on Showtime and is expected to generate hundreds of millions of dollars.
Showtime chief Stephen Espinoza was roundly booed as soon as he began wittering on about Mayweather's legacy, while UFC president Dana White was cheered loudly when he introduced McGregor. A few moments later, he made her wildest dreams come true.
The suit that the boxing legend wore at a lively press conference in Los Angeles on Tuesday is doing the talking for McGregor, quite literally!
Mayweather is widely tipped to win next month, but if McGregor gives a good account of himself he could land another lucrative boxing-rules showdown. "Somebody's "0" has got to go", he said, referring to Mayweather's flawless boxing record of 49-0.
For boxing purists, Mayweather risks blemishing an otherwise flawless record with a tawdry final episode that has been disparaged as a cynical circus-like stunt. Conor McGregor's "f**k you" suit stole the show as he appeared cool and suave compared to Mayweather's casual attire.
Heck, Pacquiao and Mayweather sold 4.6 million buys and that was with some of the hype lost after the constant delays and excuses.
"McGregor is a lot bigger than he is, but the distance is different", said Dillashaw. "There's no other way about it".
Mayweather Sr responded: 'If you do, then I'm going to knock the f*** out of you'.
Mayweather enters the bout 49-0, but hasn't fought since retiring following his win over Andre Berto on September 12, 2015.
"How's this suit look?" he laughed.
"The last time I checked he's still a professional fighter", Mayweather said of his lightly-regarded opponent.
McGregor, however, has never had a boxing match, although he is 21-3 in MMA and is the reigning UFC Lightweight champion.
It's an allegation Mayweather was quick to deny - sharing an image of a $26 million tax bill on his Facebook page and insisting "my empire is rock solid and intact". "I'm an old man".
"But it's actually July to July so I was 24 this year, which is a great jump from 84 the year before", he stated before hesitantly adding, "I mean I said I'd fight". "So whatever, I don't know".