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The fight is more than three days away but that hasn't stopped Paddy Power chiefs rewarding Mayweather backers.

The Irish bookmaker made the £250,000 pay-out this morning - despite more than 80 per cent of its customers backing McGregor.

Spokesman Paddy Power said: “We’re spinning the roulette wheel a bit here – as getting it wrong would see a serious Mac Attack on my bank balance.

“But, when you’re backing Mayweather, you’ve basically covered the whole board anyway.

“Patriotism aside, we are paying out early on a Mayweather victory – because we checked, and only one of them is a boxer.”

Such is the interest in the event, Paddy Power say that it is easily the biggest boxing betting market of all time, predicting more than £200million in bets – with most of the money expected to come in the 36-hours before the bout.

It is more than three times the size of the next biggest boxing market, when Mayweather fought Manny Pacquiao in 2015, and by far the bookie’s biggest event of the year.

(Image: GETTY)

Despite the vast skill and experience advantage Mayweather holds over first-time boxer McGregor, the bookie makes him a generous 1/4 to win the bout – and their early pay-out means Money for everyone who backed him in the outright market.

The market had opened with Mayweather at 1/20, but punters have lumped on McGregor, meaning the odds have shortened dramatically as the fight approaches, tumbling to 10/3.