K-1 World Grand Prix 2001 Final was a kickboxing event promoted by the K-1. The event was held at the Tokyo Dome in Tokyo, Japan on Saturday, December 8, 2001, in front of 65,000 spectators. It was the ninth K-1 Grand Prix final, involving eight of the world's top fighters, with all bouts fought under K-1 Rules (100 kg/156-220 lbs). The eight finalists had almost all qualified by winning preliminary tournaments (with the exception of Peter Aerts who was a runner up), while two additional fighters were invited as reserve fighters in case of any injuries.

K-1 World Grand Prix 2003 Final was a kickboxing event promoted by the K-1 organization. The event was held at the Tokyo Dome in Tokyo, Japan on Saturday, December 6, 2003 in front of 67,320 spectators. It was the eleventh K-1 World Grand Prix final involving ten of the world's best fighters (two being reservists). The eight finalists had almost all qualified via preliminary events, while two additional fighters were invited as reserve fighters (for more detail on this see bulleted list below), with all bouts being fought under K-1 Rules (100 kg/156-220 lbs).