Khabib Nurmagomedov arrived at the UFC 239 tournament, held at the T-Mobile arena in Las Vegas, as a spectator. Nate Diaz, while passing by the Russian, exchanged words with him.
As a result, a scuffle broke out and security personnel were swift to break it up.
In 2015, Nurmagomedov and the Diaz brothers (Nate has an elder brother, Nick, who's also a UFC fighter) had a fight during the WSOF 22 tournament. The fight broke out after Nate Diaz threw a bottle at Nurmagomedov.