With the turn of 2018, the snow has well and truly settled on Conor McGregor's lucrative fight with Floyd Mayweather.Attacked by boxing purists as something of a farce, even the most assured of critics couldn't help tuning in when the pair stepped between the ropes in August. After all, it was the most bizarrely brilliant meetings of both sports and personalities.Common sense and logic prevailed in the end with Mayweather extending his professional record to 50-0, claiming victory by technical knockout in the 10th round.Money proceeded to hang up his gloves in tune with the decision and McGregor, fresh from the mother of all pay days, is yet to return to the octagon.The once regular fighting talk between the two had effectively simmered to a silence until rumours that Mayweather was flirting with a foray into UFC added a new dynamic.Dana White didn't exactly throw water on the rumours and the pay packet available would be nothing short of astronomical, yet Mayweather wasn't convinced.“I never said I was going to fight in the UFC,” Mayweather said. “I didn’t say that. I just said if I wanted to and what I could do. ‘Would’ and ‘could’ do isn’t the same thing. I’m not going to do it, though.”It's looking like fight fans will just have to accept that Mayweather's third retirement, really is his last.That hasn't stopped McGregor from teasing his last opponent, though, penning a typically hilarious tweet to the American as part of a posting flurry on New Years' Day.The Irishman organised a latest round of PhotoShop wizardry to depict himself aiming a head-kick at Mayweather, shown pouting in the ring. Marry that to an amusing rhyme and it's quite the upload - take a look:

There won't be much surprise that the post has gone viral - accumulating 18,000 'likes' and 6,000 retweets at the time of writing.

And, behind it all, McGregor is exactly right.

In traversing sports, the Notorious was always going to struggle against one of the pound-for-pound greatest boxers. Had Mayweather climbed into the cage, though, it would have been a different story.

It looks like fans won't get the chance to see the weirdest of rematches but we can all imagine the narrative and at that point, it becomes pretty clear why Mayweather doesn't fancy UFC.

McGregor came into his world and he certainly found out about it.

What would happen if Mayweather and McGregor fought in the octagon? Have your say in the comments section below.