| Datum | Země | Název, adresa | Pořadatel |
|---|---|---|---|
| 31.5.2003 |  | Dangerzone - Fight Night 6 101 LoungeAngola, Indiana, United States | Dangerzone |
| 31.5.2003 | | ECC - Assault Anderson, Indiana, United States | Extreme Combat Challenge |
| 31.5.2003 | | EFC 2 - Extreme Fighter Challenge 2: The Return Yavapai-Apache National GymnasiumCamp Verde, Arizona, United States | Extreme Fighter Challenge |
| 31.5.2003 |  | FF 1 - Feenix Fight 1 Feenix Club | Feenix Fight |
| 31.5.2003 | | HHCF 8 - Attack by the Track Lancaster, Ohio, United States | Hammer House Cage Fighting |
| 31.5.2003 |  | MFC 7 - Undisputed Arctic Ice Centre, Slave Lake, Alberta, Canada | Maximum Fighting Championship |
| 31.5.2003 | | PPKA - Ultimate Ring Challenge - Fresh Blood Maggie O' Toole'sLakewood, Washington, United States | Pacific Pankration Kickboxing Association |
| 31.5.2003 | | RITO - Rumble in the Octagon 1 Bank of America CenterBoise, Idaho, United States | Rumble in the Octagon |
| 31.5.2003 |  | RK - Fight Sport Event Kaliningrad, Russia, Russia | Ring Knights |
| 31.5.2003 | | SC 15 - Slam at the Slipper Ottawa, Illinois, United States | Silverback Classic |
| 31.5.2003 |  | Seikendo - Dream Challenge Differ Ariake, Tokyo, Japan, Japan | Seikendo |
| 31.5.2003 |  | SSF - Lupus Challenge 2 Fighter Martial Arts CentreGothenburg, Sweden, Sweden | Swedish Shootfighting Federation |