McGregor out classes Mayweather in final face-off

UFC Lightweight Champion, Conor McGregor has spectacularly defied boxing legend Floyd Mayweather's prediction that he would fail to make the weight as they came to the scales before their mega-millions fight.

The Irish fighter is a full pound under the 154lbs super-welterweight limit ahead of the T-Mobile Arena clash. Mayweather was significantly but expectedly lighter at 149 1/2 lbs.

The undefeated boxer laughed back in his face before McGregor accused Mayweather of 'being in the worst shape of his life and scared.'

The more composed Mayweather responded: 'Don't worry. I've been here before. This is not going the distance.'

Earlier, McGregor received a boisterous Irish welcome as he entered the 20,000 capacity arena draped in his country's flag and sporting glasses hinged with sun lenses.

Mayweather responded to his mixed reception by pointing to his white 'The Best Ever' baseball cap and T-shirt, smiling broadly and then warning fans of the Irishman: 'This will be Conor McGregor's last fight also.'

The coming to the scales of the two champions from different combat sports was preceded by a showing on giant screens of clips of their hostile world promotional tour, with the expletives bleeped out.

There were loud cheers for McGregor and boos for Mayweather but no unbecoming conduct by the rival boxing and UFC fans.