Din Yero Thomas (/ˈdiːn/; born September 28, 1976) is an American former mixed martial artist who was featured on The Ultimate Fighter 4: The Comeback. In the Ultimate Fighting Championship, Thomas is a UFC 41 Lightweight Tournament Semifinalist. He holds a Black belt in Brazilian Jiu-Jitsu under Ricardo Liborio and currently runs two successful Brazilian Jiu-Jitsu and MMA academies in Port St. Lucie, Florida.[2] Thomas holds notable victories of (UFC Lightweight Champion) Jens Pulver, (UFC Welterweight Champion) Matt Serra, and (Strikeforce Lightweight Champion) Clay Guida.