Nate Diaz competed in World Extreme Cagefighting.
Nathan Donald `` Nate '' Diaz ( born April 16 , 1985 ) is an American professional mixed martial artist currently competing for the Ultimate Fighting Championship ( UFC ) . He was the winner of The Ultimate Fighter 5 . Prior to signing with the UFC , Diaz competed in World Extreme Cagefighting , Strikeforce , and Pancrase .