Frank Shamrock
is a Japanese mixed martial artist currently fighting at Welterweight. A longtime veteran of the Pancrase organization, Kunioku captured the King of Pancrase Middleweight Championship and King of Pancrase Welterweight Championship before leaving the organization in 2004 to compete in the K-1 HERO'S mixed martial arts organization. He holds notable victories over Frank Shamrock, Nate Marquardt, Masakatsu Funaki, and Genki Sudo.