Tsuyoshi Kosaka

Tsuyoshi Kosaka is a Japanese mixed martial artist and professional wrestler who most recently competed in the Heavyweight division of RIZIN. A professional competitor MMA competitor since 1994, he has also competed for the UFC, PRIDE Fighting Championships, RINGS, Pancrase, and DEEP. Kohsaka is the former King of Pancrase Super Heavyweight Champion. His "TK guard" position, a precursor to modern butterfly guard, is famous for its efficiency; former UFC champions Frank Shamrock and Maurice Smith have both credited him with having vastly improved their work from that particular position.