Nathan Donald Diaz is an American professional mixed martial artist, currently signed with the Ultimate Fighting Championship (UFC). Diaz is the younger brother of former Strikeforce Welterweight Champion and WEC Welterweight Champion, Nick Diaz. Prior to signing with the UFC, Diaz competed in World Extreme Cagefighting, Strikeforce, and Pancrase. He has been in the UFC since winning The Ultimate Fighter 5.
