Khabib Nurmagomedov, right, is held back by referee Herb Dean after fighting Conor McGregor, bottom, during a lightweight title mixed martial arts bout at UFC 229 in Las Vegas, Saturday, Oct. 6, 2018. Nurmagomedov won the fight by submission during the fourth round to retain the title. (AP Photo/John Locher)
Khabib Nurmagomedov, right, is held back by referee Herb Dean after fighting Conor McGregor, bottom, during a lightweight title mixed martial arts bout at UFC 229 in Las Vegas, Saturday, Oct. 6, 2018. Nurmagomedov won the fight by submission during the fourth round to retain the title. (AP Photo/John Locher) John Locher AP
Khabib Nurmagomedov, right, is held back by referee Herb Dean after fighting Conor McGregor, bottom, during a lightweight title mixed martial arts bout at UFC 229 in Las Vegas, Saturday, Oct. 6, 2018. Nurmagomedov won the fight by submission during the fourth round to retain the title. (AP Photo/John Locher) John Locher AP