The 'Greatest of All Time' debate can be as infuriating as it is irresistible for fans in any sport and Khabib Nurmagomedov's win at UFC 254 has sparked renewed conversation in MMA circles.
Having moved to 29-0 and retired with that perfect record in tact, UFC president Dana White put his cards on the table, writing: 'You accomplished EVERYTHING you set out to do.
'You are the P4P best fighter in the world and you truly are the G.O.A.T of the sport. #29-0.'
Khabib Nurmagomedov (left) retired undefeated after beating Justin Gaethje at UFC 254
The Russian fighter submitted his challenger in the second round of their main event
White previously had Anderson Silva as his pick for the No 1 spot but admitted that if Khabib could beat Justin Gaethje, as he did in such fine style, then the Russian would take over.
But not everybody agrees with White, even if UFC's P4P rankings now do. Jon Jones was quick to bash those dismissing his claims on social media afterwards while Georges St Pierre remains the choice for many fans.
Conor McGregor has influenced the sport like no other while Demetrious Johnson reigned supreme for years and Amanda Nunes also has a case to make.
Here, Sportsmail takes a closer look at the contenders for GOAT status.Khabib Nurmagomedov (29-0)
The undefeated record is a holy grail for MMA fighters. It is incredibly easy to slip up and lose at some point so to hang up the gloves with 29 professional victories in a row is a remarkable achievement.
Khabib also touched on the fact that in reality, there are no more top contenders for him to get motivated by.
Dustin Poirier, Gaethje and McGregor are the top three contenders to his throne and he's beaten all three of them.
In Khabib's favour for GOAT status is the dominant manner of his wins and the almost folkloric way his team-mates have spoken about him never even losing a round in training.
Khabib shocked the MMA world by announcing his retirement after the win over Gaethje
Nobody has been able to cope with the Russian's wrestling and Gaethje was no different
Everybody knows what Khabib will do but nobody can stop it. The wrestling ability and understanding he has, combined with a gas tank that never runs out is on another level to anyone who has stepped into the octagon.
Much was made of Gaethje's wrestling pedigree, he was the best defensive grappler to face Khabib in the UFC, but the Dagestani took him down with relative ease.
Poirier had him in trouble with a guillotine during their fight but few have ever managed to put Khabib in a dangerous spot.
Perhaps counting against him is the fact that his rise to the lightweight summit was populated by middle-of-the-road opponents and he has never challenged himself in another weight class.
Khabib won the vacant title against Al Iaquinta so the meat of his CV came against McGregor, Poirier and Gaethje. Is that enough to secure GOAT status? For many it is but others point to greater bodies of work over a longer period of time.
Dana White (right) believes Khabib is the pound-for-pound greatest and the No 1 fighter ever
Khabib has retired at 32, in his prime and the same age that GSP was when he decided to step away from the sport.
The Russian cited the media responsibilities, weight cutting and draining training as additional reasons for his exit, not too dissimilar to St-Pierre alluding to 'burnout'.
Having dominated the welterweight division for so long, GSP took four years out before returning to beat Michael Bisping and claim the middleweight title in 2017.
He is interested in a dream megafight against Khabib but will not be pushing to make it happen as he respects the Russian's wishes.
Georges St-Pierre (left) defeated Michael Bisping (right) after coming out of retirement
The Montreal native was one of the most well-rounded fighters ever seen in the UFC and strung together 10 successful title defences against tough opposition.
He beat B.J. Penn, Nick Diaz, Matt Hughes and Josh Koscheck all in their prime and it could be argued those are tougher than the names Khabib has had to face.
That said, GSP has two blots on his copybook. A submission defeat by Hughes and shock KO defeat by Matt Serra.
If he did ever return to face Khabib then it would settle the GOAT debate for most fans once and for all.
GSP is regarded by many has the best fighter in MMA history given his overall body of work
The issue with doping is what downgrades Jones in the eyes of many.
In 2016 he was suspended for a year after testing positive for two banned substances, clomiphene, an anti-estrogenic substance, and letrozole.
The following year, Jones was stripped of his UFC light-heavyweight title after testing positive for the steroid Turinabol.
Many are able to overlook the shortcomings of Jones in his personal life in the GOAT debate but to be caught twice by USADA for using performance-enhancing drugs puts an asterisk next to his name.
Jon Jones has never truly been beaten and only has one disqualification defeat on his record
If it wasn't for those failed tests, it would be difficult to argue against Jones being the best to ever do it.
He became the UFC's youngest ever champion aged just 23, beat the who's who of the light-heavyweight division and has looked untouchable in most fights.
Chael Sonnen, Alexander Gustafsson, Lyoto Machida, Rashad Evans and of course Daniel Cormier all suffered at his hands.
The one defeat came through disqualification for illegal elbows against Matt Hamill, so is hardly a legitimate loss.
He took exception to those calling Khabib