#1 Tyron Woodley.

Colby Covington knew way before that Tyron Woodley will be his final challenge ahead of his welterweight title. And has been using his favorite weapon of choice, trolling to agitate him get a shot at the title. Woodley never really paid much attention to Colby's gimmicks.
Now that, Colby has become the Interim Champ there is a reason for Tyron to worry. The way Colby beat Dos Anjos is a real cause of concern for every fighter in the division. Now that Colby has gained Tyron's attention, the trolling game has been shifted to next level.
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The former teammates are all set to square off against each other for a welterweight title unification bout real soon and the drama is high. Tyron has posted a video on his social media stating that he is hate Colby more than anything and is going to embarrass in front of the entire crowd.
Can't say how much Colby is concerned over Tyron's threat, but it is a sure thing that Colby succeeded in sliding into Tyron's head with his trash talk. He even challenged Colby for a Takedown contest after Colby claimed he had a better takedown than the welterweight champion.
It is a sure thing that the days leading up to them fighting each other will be guaranteed to be entertaining for the spectators and the fight is going to be one of the biggest grudge matches in the history of UFC.