Irish mixed martial artist Conor McGregor, the first-ever two-division UFC champion (lightweight and featherweight), lost to Russia's Khabib Nurmagomedov in the fourth round at UFC 229. McGregor, making his return to UFC for the first time since November 12, 2016, suffered his MMA career's fourth defeat. Meanwhile, Khabib retained the lightweight title and took his 100% win record to 27-0.