Walker Johnny da Silva Barra de Souza, best known as Johnny Walker, is a Brazilian professional mixed martial artist. He currently competes in the Light Heavyweight division in the Ultimate Fighting Championship (UFC). A professional competitor since 2013, Walker gained entrance into the UFC by competing on Dana White's Contender Series and also previously competed for Jungle Fight in his native Brazil. As of December 19, 2023, he is #7 in the UFC light heavyweight rankings.

Khalil Ibn Rountree Jr. is an American professional mixed martial artist who currently competes in the Light Heavyweight division of the Ultimate Fighting Championship (UFC). As of December 12, 2023, he is #8 in the UFC light heavyweight rankings.