The most popular fighter in UFC history, Conor McGregor, will meet Donald "Cowboy" Cerrone -- the winningest fighter in UFC history -- in the main event of UFC 246 on Saturday in Las Vegas.
As the UFC's first pay-per-view headliner of the new decade, this fight promises to have an enormous impact on the rest of the year. Will McGregor, 31, regain the form that carried him to two UFC championships in 2015 and 2016? Or will Cerrone, 36, pick up the biggest victory of his storied career?
ESPN asked some of the top athletes and trainers in the sport for their predictions.