McGregor, who will be making his professional boxing debut, appeared out of the tunnel wrapped in an Irish flag, an Irish ballad playing as he slowly made his way to the stage.
McGregor, who was on social welfare from the Irish government as recently as four years ago, is the blue collar populist champion but the bulk of the money being wagered is all in Mayweather's corner.
"He's full of water - that's the worst shape I've ever seen him in", the Dubliner said.
"Las Vegas is ours now". Win or lose, Mayweather will be toasting his latest massive payday on Saturday night, perhaps with a third retirement on the horizon.
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The high-rollers of the gambling world agree, with the lion's share of the money being bet on the fight placed on Mayweather. He's not a bull in a china shop by any stretch of the imagination, but if his only chance according to the experts is to bum rush Mayweather and catch him early, will he change his strategy and go for it all?
A nonplussed Mayweather shrugged off his weight disadvantage and once again vowed to stop McGregor inside the distance. I know what it takes when it's a fight of this magnitude, ' said Mayweather. "Mark my words - I'm not anxious about the scales".
Saturday's fight is set to smash records as the most bet-upon bout in Las Vegas history. McGregor would realize that he only has his fists to use and Mayweather is a champion in that. Will Mayweather walk straight into that hand?
"Their response nearly universally was 'We don't care if it's a mismatch. if there's a.01 chance that something incredible could happen, we need to watch it'".
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This glorious mural just went up in Temple Bar, Dublin, immortalising the fight through the medium of street art.
Others however have sounded a note of caution, citing potential safety risks to McGregor given the chasm of experience between the Irishman and Mayweather. However, when Premier League footballer Zlatan Ibrahimovic was asked to pick his favorite he had something interesting to say.
"(McGregor) needs to think about himself in this fight, because if he gets seriously injured, he might not ever be the same fighter or he might not even fight again".
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