Gilbert Burns tests positive for COVID-19, out of UFC 251 headliner vs. Kamaru Usman MMA JunkieUFC 251 Free Fight: Max Holloway vs Brian Ortega UFC - Ultimate Fighting ChampionshipGilbert Burns tests positive for COVID-19, pulled from UFC 251 main event against Kamaru Usman MMA FightingMax Holloway: I trained for UFC 251 over Zoom, didn't spar | ESPN MMA ESPN MMAMidnight Mania!