World reacts after Khabib Nurmagomedov's retirement bombshell

UFC fans have been left in disbelief after an undefeated superstar called time on his legendary career as emotion spilled over.

Khabib Nurmagomedov is unbeatable.

Nurmagomedov returned to the cage for the first time in over a year to defend his lightweight title against Justin Gaethje but showed no rust in a second round win.

But it was immediately after the fight when jaws really hit the floor as the Russian superstar called time on his legendary career.

In the co-main event, Aussie Robert Whittaker continued his rise back to the middleweight title by defeating American monster Jared Cannonier.

Recap the entire night right here.