Frank Shamrock is a retired mixed martial arts fighter. Shamrock was the first to hold the UFC Middleweight Championship (later renamed the UFC Light Heavyweight Championship) and retired as the four-time defending undefeated champion. Shamrock was the No. 1 ranked pound for pound fighter in the world during his reign as the UFC Middleweight Champion.
Shamrock has won numerous titles in other martial arts organizations, including the interim King of Pancrase title, the WEC Light Heavyweight Championship and the Strikeforce Middleweight Championship.
He was named “Fighter of the Decade” for the 1990s by the Wrestling Observer, “Best Full Contact Fighter” by Black Belt magazine (1998), and three time “Fighter of the Year” by Full Contact Fighter Magazine.
He is a 7th degree black belt in submission fighting, awarded by O-Sensei Philip S. Porter of the United States Martial Arts Association.
He is the adopted brother of UFC Hall of Famer Ken Shamrock. He holds the Guinness World Records for Fastest UFC Title Fight Victory by Submission in 16 seconds over Kevin Jackson at UFC Japan in Yokohama, Japan. An author, entrepreneur, philanthropist and social activist, he is a color commentator for Showtime Networks and was a brand spokesman for Strikeforce.