Khabib. McGregor's cardio goes to hell after the midway point of round 2 and that's if it's a striking contest. The only way McGregor can win is KO. Khabib get's a hold of him it's over. He'll maul Conor. Once Conor get's taken down, his limited gas tanks goes away even faster. It'll basically be what Khabib did to Michael Johnson and Edson Barbosa.