The UFC 279 fight card underwent a massive shake-up following Khamzat Chimaev missing weight Friday morning. Nate Diaz now faces Tony Ferguson in the main event. Undefeated rising welterweight contender Khamzat Chimaev was supposed to square off with Nate Diaz in the Stockton superstar’s final fight on his UFC contract. Even a backstage scuffle that canceled Thursday’s UFC 279 pre-fight press conference didn’t derail the bout. It took Chimaev stepping on the scale 7.5 pounds over the allowed weight to do that.