UFC 254 Khabib Nurmagomedov vs Justin Gaethje Live Stream Khabib Nurmagomedov, right, has competed only twice in the last 24 months, partly because of the pandemic. His most recent win was over Dustin Poirier in September 2019.Credit...Mahmoud Khaled/Associated Press The biggest Ultimate Fighting Championship bout of the year pits Khabib Nurmagomedov against Justin Gaethje for the 155-pound championship, and it will be staged on Saturday night on Yas Island in Abu Dhabi without paying spectators present. The U.F.C. 254 pay-per-view event, available in the United States through ESPN+, carries an unusual start time of 2 p.m. Eastern. U.F.C., which usually times its events to capture a nighttime audience in the United States, is still expecting to draw American audiences while also targeting fans in Europe and Russia, where Nurmagomedov, the undefeated lightweight champion, is highly popular. “You have all the ingredients for a massive fight,” Dana White, U.F.C.’s president, said this week. “This thing is tracking to be the biggest fight we’ve ever done.” Interesting considering this main event was not on the radar in January.