Marvin Sonsona sparring Kevin Johnson inside Mayweather Boxing Club

Former world champion Marvin Sonsona was in Las Vegas visiting the Mayweather Boxing Club. While there he got in some work with promising amateur Kevin Johnson For more exclusive videos from Pro Boxing Insider please SUBSCRIBE to our Youtube page at or visit our sites at or . Follow Jeff Mayweather on twitter @JeffMayweather1 Follow Pro Boxing Insider @PBInsider Follow Pro MMA Insider @ProMMAInsider