Mirko Filipović, better known by his ring name Mirko Cro Cop, is a Croatian former professional mixed martial artist, kickboxer and amateur boxer. He is mostly known for his time in Pride Fighting Championships. Cro Cop fought in the UFC, K-1, RIZIN and Bellator. He is widely considered one of the greatest Heavyweight Kickboxers and MMA fighters of all time.

Ernesto Frits Hoost is a Dutch retired professional kickboxer. A four-time K-1 World Champion, Hoost is considered to be one of the greatest kickboxers of all time. Debuting in 1993 at the K-1 World Grand Prix 1993, where he came just one win short of the world title, Hoost announced his retirement thirteen years later on 2 December 2006 after the K-1 World GP Final tournament in Tokyo Dome, Japan. Hoost holds notable victories over Peter Aerts (4x), Branko Cikatić, Mirko Cro Cop (3x), Jérôme Le Banner (3x), Andy Hug (3x), Ray Sefo (3x), Musashi (2x), Mike Bernardo, Francisco Filho (2x), Sam Greco, Stefan Leko (3x), Mark Hunt, Cyril Abidi, and Glaube Feitosa.