#2. Colby Covington
At one point, Colby Covington was on the verge of being cut from the UFC despite the four-fight win streak he was on at the time. According to Covington himself, the UFC's rationale was that his fighting style wasn't exciting nor was he a character the fans found interesting.
Upon being needled by the crowd after beating hometown hero Demian Maia in São Paulo, Brazil, Covington's new persona was born. He viciously insulted the Brazilian crowd and the country as a whole. The people in attendance were so incensed that they peppered Covington with drinks and anything within reach.
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Following the incident, Covington adopted an outlandish persona that he took to almost cartoonish heights. He began cutting promos antagonizing everyone, whether they were future opponents or fighters in divisions he would never compete in.
No one was spared, as Covington even targeted media personalities and athletes from other sports. It was all done in an effort to increase his notoriety, and it heightened fan interest in the promos he's cut since on the likes of Kamaru Usman, Jorge Masvidal, and Dustin Poirier.
#1. Nate Diaz
Few fighters can cut a promo quite like Nate Diaz. With a current MMA record of 20 wins and 13 losses, Nate has had a career defined by start-stop win streaks.
Yet, the younger Diaz brother has managed to achieve unprecedented levels of success largely due to his unapologetic promos. Off the heels of a convincing win over Michael Johnson back in 2015, Nate cut a promo that would spark the biggest rivalry in UFC history.
Calling out Conor McGregor, Nate disparaged the Irishman for presumably taking everything he himself had worked for. He challenged him to a fight that would eventually come to fruition when the stars aligned, after Rafael dos Anjos pulled out of a scheduled title fight with McGregor.
This caused Nate to be booked as the late-notice replacement. Years later, the overpowering effectiveness of Nate's promos allowed him to essentially talk the UFC into creating an imaginary BMF championship for a matchup between him and Jorge Masvidal.