ZERO1 Title Holders
NWA United National Heavyweight Champion
Kengo Mashimo
(Won 05/04/08 vs. Ryouji Sai)
| Won By | Won From | Location | Date |
| Kengo Mashimo 4 | Ryouji Sai | Chiba, Japan | 05/04/08 |
| Yoshihito Sasaki | Sandy Beach | Sapporo, Japan | 03/29/08 |
| Sandy Beach | Yoshihito Sasaki | Nagoya, Japan | 02/11/08 |
| Yoshihito Sasaki | Daisuke Sekimoto | Tokyo, Japan | 11/13/07 |
| Daisuke Sekimoto | Ryouji Sai | Tokyo, Japan | 03/08/07 |
| Ryouji Sai | Kohei Sato | Osaka, Japan | 11/11/06 |
| Kohei Sato 3 | Ryouji Sai | Tokyo, Japan | 02/26/06 |
| CW Anderson 2 | Kohei Sato | Tokyo, Japan | 03/27/05 |
| Takao Omori | Masato Tanaka | Tokyo, Japan | 10/08/04 |
| Masato Tanaka 1 | Steve Corino | Tokyo, Japan | 01/31/04 |
1 Decision match to determine the first champion.
2 Decision match. Omori vacates the title on 01/23/05 when he won the AWA title.
3 Decision match. CW Anderson vacates the title 02/03/06 due to injury.
4 Decision match. Yoshihito Sasaki vacates the title on 04/25/08 due to injury
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