The night is finally here: Floyd Mayweather will take on first-time boxer Conor McGregor in Las Vegas.Money Mayweather has a pristine record of 49-0 and he is looking to make UFC lightweight champion the magic number 50 on his incredible record.While the 40-year-old is the heavy favourite with the bookies, McGregor's deadly punching inside the octagon has given plenty punters some food for thought.One man who doesn't seem to be thinking too much about it is Mayweather himself.The American was was caught relaxing backstage ahead of the biggest fight of his career - certainly money wise - and he wasn't preparing like most fighters you see.No, instead, he was dancing and getting a head massage.That's how relaxed this man is about the whole affair! Somehow, we can't see McGregor adopting the same approach.Check out Mayweather looking the most relaxed man in the world below:

A lot has been made of McGregor's chances in this fight, but after he appeared to knockdown former world champion Pauli Malignaggi in sparring - though Malignaggi contends it was a shove - many seemed to give the Notorious One a greater chance.

Speaking of the footage released of the sparring session, Mayweather seemed less than impressed.

“My thoughts is I think it was real interesting but a lot of illegal rabbit punching behind the head, a lot of stuff that was illegal. A lot of grappling, a lot of wrestling, a lot of illegal shots. That’s just my opinion,” Mayweather told MMAWeekly.com on Thursday during a media conference call.

“I’m pretty sure the referee’s going to be fair on both sides. I want the referee to be fair and treat both competitors, myself and Conor McGregor, treat us both, be even and treat us fair. I just want to have a good solid fight.”

Can McGregor land one of his textbook left-handers? Mayweather has struggled with southpaws before, will that help McGregor? Or, will Mayweather completely outclass McGregor? Not long until we find out.