| Date | Champion | Event | â„– of defenses |
|---|---|---|---|
| March 4, 2007 – present | Semmy Schilt – Netherlands def Ray Sefo |
K-1 World GP 2007 in Yokohama | 4 3 April 2010 Errol Zimmerman – Curaçao 3 29 June 2008 Jerome Le Banner – France 2 13 April 2008 Mark Hunt – New Zealand 1 23 June 2007 Mighty Mo – American Samoa |
| Date | Champion | Event | â„– of defenses |
|---|---|---|---|
| April 28, 2007 – December 17, 2008[15] | Badr Hari – Morocco def Yusuke Fujimoto |
K-1 World GP 2007 in Hawaii | 1 29 June 2008 Glaube Feitosa – Brazil |
| March 28, 2009 – October 21, 2011 | Kyotaro Fujimoto – Japan def Gokhan Saki |
K-1 World GP 2009 in Yokohama | 1 3 April 2010 Peter Aerts – Netherlands |