Kensuke Sasaki is a Japanese retired professional wrestler, mixed martial artist, and founder of the now-defunct wrestling promotion Diamond Ring. Sasaki is the first of five men ever to hold all three of puroresu's major heavyweight titles, the others being Yoshihiro Takayama, Keiji Muto, Satoshi Kojima, and Yuji Nagata- totalling seven world championship reigns. Sasaki also competed in MMA and won both fights by submission, remaining undefeated in mixed martial arts competition.