Justin Gaethje’s UFC debut set vs. Michael Johnson in TUF 25 Finale headliner in Las Vegas Posted byadmin January 3, 2020 Leave a comment on Justin Gaethje’s UFC debut set vs. Michael Johnson in TUF 25 Finale headliner in Las Vegas Gaethje had success as the champ in World Series of Fighting but at a news conference in Dallas, his first opponent Michael Johnson told him to expect another level.