#1 Chael Sonnen
Yes, it's not Conor McGregor who tops the list, but The American Gangster, Chael Sonnen who is the King of trash talking. People often fail to realize the power of Sonnen's words. Despite not having won a single UFC title, Sonnen had the verbal skills to provoke any fighter to accept his challenge to a fight.
Joe Rogan once stated that Muhammad Ali began the era of trash talking but 'Chael Sonnen took it to a whole new level'. One couldn't help but not turn away his or her ears when The American Gangster opened his mouth.
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His words had so much power that he talked his way into securing a title shot at Jon Jones' light heavyweight strap, immediately after losing a rematch with Silva for the middleweight title.
No one could out-talk Sonnen and he is often regarded as one of the best promoters of the sport. Had he been a UFC Champion winning big fights, McGregor would have had some tough competition.