Alexey Ignashov is a Belarusian former Heavyweight kickboxer. He is a four-time Muay Thai World champion, K-1 World GP 2003 in Paris and K-1 World GP 2001 in Nagoya tournament champion. As of 2011 he is living in Auckland, New Zealand and training at Balmoral Lee Gar Gym under Lollo Heimuli.
Ray Sefo is a New Zealand fight promoter and retired kickboxer, boxer, and mixed martial artist of Samoan descent. He was the K-1 World Grand Prix 2000 Runner-up, is a six-time Muay Thai World Champion, and was an eight time K-1 World Grand Prix Finals tournament participant. He is the president of MMA promotion Professional Fighters League. In kickboxing, he defeated world champions Jerome Le Banner, Peter Aerts, Stefan Leko, Mike Bernardo, and Mark Hunt. He is widely considered to be one of the greatest heavyweight kickboxers to have never won the K-1 World Grand Prix.
Jérôme Philippe Le Banner is a French kickboxer, mixed martial artist, and professional wrestler. Le Banner fought for most of his career in K-1 and became known for his aggressive fighting style and knockout power. He is a 2-time K-1 World Grand Prix runner up, a 2-time K-1 Preliminary Grand Prix champion, and is a multiple time world champion in Kickboxing and Muay Thai. He holds notable victories over Ernesto Hoost (twice), Francisco Filho, Mark Hunt, Sam Greco, Mike Bernardo (twice), Peter Aerts, Rick Roufus, Remy Bonjasky, Tyrone Spong, Stefan Leko (twice), Masaaki Satake, Maurice Smith, Gary Goodridge (twice), Musashi (twice), Cyril Abidi and Choi Hong-man (twice).
Andreas "Andy" Hug was a Swiss karateka and kickboxer who competed in the heavyweight division. Considered to be one of the greatest heavyweight kickboxers of all time, Hug was renowned for his ability to execute numerous kicking techniques rarely seen in high-level competition. Although he was usually smaller than his opponents, standing at 1.80 m and being barely a heavyweight, weighing around 98.0 kg in his prime, he made up for his lack of size with his tremendous athleticism and speed. A southpaw, his trademark kicks included the axe kick and the "Hug Tornado", a low spinning heel kick targeting his opponents' thighs.
Magomed "The Propeller" Magomedov is a Russian former kickboxer fighting out of Chinuk Gyn from Minsk, Belarus. He was six time amateur Russian kickboxing champion and the professional WMC and IMF Light Heavyweight World Muay Thai Champion.
Stefan Leko is a German heavyweight kickboxer. He is the current WKA Super-Heavyweight world champion in kickboxing, and former Muay Thai world super-heavyweight champion and Kickboxing world super-heavyweight champion, WMTA, WKN, IKBO, IKBF, and WKA world champion, K-1 European Grand Prix 1998 champion, 1999 K-1 Dream champion and two time K-1 World Grand Prix in Las Vegas tournament champion. He fights out of Team Golden Glory in Breda, Netherlands under Cor Hemmers. Since 2011 Stefan Leko is coached and managed by Tom Trautsch and won two Heavyweight World Champion Titles.
Xhavit Bajrami is a Swiss former kickboxer who competed in the heavyweight division. A Seido karate practitioner and Andy Hug student, Bajrami built up an undefeated record domestically before he was recruited by K-1 where he won the K-1 Braves '99 tournament and finished as runner-up in two other tournaments. He is also a two-time Muay Thai world champion, having won the ISKA World Super Heavyweight title in 2004 and the WKN World Super Heavyweight strap in 2010.
Eduardo "Morpheus" Maiorino was a Brazilian professional kickboxer and mixed martial artist. He was a three time Brazilian Heavyweight Muay Thai Champion, the K-1 Brazil 2004 Tournament finalist and champion, and a World Muay Thai Association (WMA) Super Heavyweight World Champion.
Ionuţ Iftimoaie is a retired Romanian kickboxer. Besides the K-1, Iftimoaie has fought for a number of other promotions including the Local Kombat and SUPERKOMBAT. He defeated names such as Freddy Kemayo, Petar Majstorović, Sergei Gur or Jorge Loren.
Yohan Lidon is a French Muay Thai kickboxer. He is a 3-time world champion in Muay Thai and kickboxing - including being the first ever It's Showtime 73MAX world champion.
Sem "Semtex" Braan is a Dutch Muay Thai super middleweight kickboxer fighting out of Amsterdam, Netherlands for Mejiro Gym. He is the 2008 It's Showtime Reality Show winner currently competing in the It's Showtime 77MAX division.
Dmitry 'Black Valet' Valent is a Belarusian Muay Thai middleweight/super middleweight kickboxer. He is the former WKN Middleweight Oriental rules and Muay thai champion, former WMC Light Heavyweight champion, two time WMC I-1 World Muaythai Grand Slam champion and two time Kunlun Fight 80kg tournament runner-up.
Grégory Tony is a French heavyweight kickboxer and professional boxer fighting out of Paris. He is three time French kickboxing champion, three time French muaythai champion, one time French boxing champion, two time European kickboxing champion, one time Intercontinental muaythai champion and two time muaythai world champion.
Luís "Dinga" Reis is a Portuguese Muay Thai kickboxer of Cape Verdian descent fighting out of Lisbon, Portugal for the Olival Gym. He is a K-1 MAX and It's Showtime regional champion who has also won medals for Portugal at amateur level. His older brother José Reis is also a respected kickboxer.
Henriques Zowa is an Angolan-Dutch professional kickboxer and boxer, fighting out of Simson Gym in Almere, Netherlands.
Frank Muñoz is a Spanish heavyweight kickboxer, who has competed in the SUPERKOMBAT Fighting Championship, where he is a former 2013 SUPERKOMBAT World Grand Prix Tournament Champion. He is also the former WAKO-Pro K-1 European champion.
Stéphane Ippo Susperregui is a French kickboxer. He is the current WKN World Oriental Rules Heavyweight and former WKA K-1 World Heavyweight champion.
Tomáš Hron is a Czech kickboxer who has fought for the K-1, It's Showtime and SUPERKOMBAT promotions. Former Kings of The Ring, WKA and WKN champion and current Kings of The Ring heavyweight world champion.
Sergiano Herbert Cairo, better known as Redouan Cairo is a Surinamese-Dutch kickboxer fighting in the Superkombat Fighting Championship where he is the 2013 Superkombat World Grand Prix Tournament Runner-up. Also a Mixed martial artist, he is a former WAKO-Pro world cruiser heavyweight K-1 rules -94.1 kg champion.
Vladimír Moravčík is a Slovak middleweight Muay Thai Fighter.
Janosch Nietlispach
Stefan Leko 
Rico Verhoeven 
Frédéric Sinistra 
Tomáš Hron 
Xhavit Bajrami 
Ergin Solmaz
Magomed Magomedov 
Tibor Nagy
Errol Zimmerman 
Michael McDonald 
Luca Sabatini
Humberto Evora
Topi Helin 
Vitali Akhramenko 
Brice Guidon 
Ionuţ Iftimoaie 
Mike Bernardo 
Ewerton Teixeira 
Jordi Ramis
Siniša Andrijašević
Martin Holm 
Dimitri Alexudis
Ray Sefo 
Shingo Koyashu