2) Georges St-Pierre (MMA record 26-2-0)
UFC fans widely consider Georges St-Pierre to be the greatest fighter of all time. His conquests inside the octagon will be remembered for years to come. St-Pierre was a two-division champion in the UFC, having won titles in the welterweight and middleweight divisions.
Unlike most fighters who wait until they hit a rough patch to call time on their careers, GSP quit the sport when he was at the top of his game. When he retired from MMA, St-Pierre was on an incredible 13-fight win streak in the UFC. He was also the undisputed middleweight champion.
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He never lost his welterweight title either, but it was vacated due to inactivity following his victory against Johny Hendricks at UFC 167. Now 40, GSP is still in perfect shape, and speculation surrounding his potential return often does the rounds in the world of MMA.
Most recently, GSP also expressed a desire to fight the undefeated Khabib Nurmagomedov. However, 'The Eagle' doesn't seem interested at the moment. Well, who can tell what the future holds? If GSP and Nurmagomedov ever return to fight each other, the pair will generate massive hype and break several PPV records for sure.
1) Khabib Nurmagomedov (MMA record 29-0)
The one fighter that UFC fans and president Dana White want most to step out of retirement is none other than Khabib Nurmagomedov. The Eagle is 29-0 in his MMA career and is arguably the greatest lightweight in UFC history. In his entire career, Nurmagomedov has lost just one round in his UFC 229 headliner against Conor McGregor.
When Khabib announced his retirement after making quick work of Justin Gaethje at UFC 254, it came as a shock to the entire MMA community across the globe. Dana White tried his best to persuade Nurmagomedov to return to the octagon but the Russian wasn't willing to budge.
According to his manager, Nurmagomedov was even offered $100 million to fight Floyd Mayweather in a boxing match. However, any sum of money won't be enough to convince Nurmagomedov to return to fighting. That's because he promised his mother he'd stop fighting after the bout against Gaethje and he kept his word.
Nurmagomedov has made it clear that he'll only fight again if his mother approves of it and at the moment, it doesn't seem likely.