Kamaru Usman talks Colby Covington, Justin Gaethje and Canelo Alvarez

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Kamaru Usman goes 1-on-1 with Yahoo Sports' Kevin Iole and says he's willing to step into the boxing ring with Canelo Alvarez after the two of them, both No. 1-ranked fighters in their respective sports, headline pay-per-view cards on Saturday. The UFC welterweight champion also discusses his rematch with Colby Covington, training with Justin Gaethje and whether he's thought about retirement.