This event features six world title fights and an 8-Man Super Featherweight Tournament.
Wei Rui, came overweight at the weigh-ins and his title was vacated.
K-1 World GP 2018: inaugural Cruiserweight Championship Tournament will be a kickboxing event held by K-1 on September 24, 2018 at the Saitama Super Arena in Saitama, Japan.
K-1 World GP 2018: 3rd Super Lightweight Championship Tournament will be a kickboxing event held by K-1 on November 3, 2018 at the Saitama Super Arena in Saitama, Japan.
K-1 World GP 2018: K-1 Lightweight World's Strongest Tournament was a kickboxing event held by K-1 on December 8, 2018 at the Edion Arena Osaka in Osaka, Japan.