Masa (Masato) Tanaka 		04/01/31  Tokyo
  * Defeats Steve Corino to become first champion.
Takao Ohmori			04/10/08  Tokyo
  * Wins AWA World Heavyweight Title on 05/01/23
    in Tokyo; ZERO-ONE leaves NWA in 04/10;
    United National Title is declared vacant
    on 05/02/28 for lack of title defense.
C.W. Anderson			05/03/27  Tokyo
  * Defeats Kohei Sato; vacates on 06/02/03 due
    to back injury.
Kohei Sato			06/02/26  Tokyo
  * Defeats Ryoji Sai.
Ryoji Sai			06/11/11  Osaka
Daisuke Sekimoto		07/03/08  Tokyo
Yoshihito Sasaki		07/11/13  Tokyo
Sandy Beach (Micah Taylor)	08/02/11  Nagoya
Yoshihito Sasaki [2]		08/03/29  Sapporo
  * Vacates on 08/04/25 due to back injury.