Raoni Barcelos tests positive for COVID-19, withdraws from UFC Vegas 20 fight Bantamweight Raoni Barcelos announced he tested positive for COVID-19 on his Twitter account, prior to his upcoming bout at UFC Vegas 20. Feb 22, 2021, 2:00pm EST If you buy something from an SB Nation link, Vox Media may earn a commission. See our ethics statement. Share this story UFC bantamweight contender Raoni Barcelos became the latest fighter forced to leave a card due to the coronavirus. Once paired up to face Marcelos Rojo at UFC Vegas 20, a positive COVID-19 test threw a wrench into the Brazilian’s plans, who will have to withdraw from the event in order to recover properly.