Sebastiaan "Bas" Rutten is a Dutch retired mixed martial artist, Karate and Taekwondo blackbelt, and Muay Thai kickboxer. He was a UFC Heavyweight Champion, a three-time King of Pancrase world champion, and finished his career on a 22 fight unbeaten streak. He is currently the star of Punk Payback on Fuel TV and co-host of Inside MMA on AXS.TV.
As a professional fighter, one of his favorite tactics was the liver shot, and he popularized its use in MMA. Rutten is known for his charisma and has capitalized on his celebrity status since retiring from fighting in 1999. He has worked as a color commentator in several MMA organizations, including Pride, and has appeared in numerous television shows, movies, and video games. He also coaches MMA and has authored several instructional materials.