Simon Marcus is a Canadian-Jamaican Muay Thai kickboxer, that defeated which American professional Muay Thai kickboxer, twice?
Joe Schilling
Simon Marcus
Simon Marcus (born 5 November 1986), also known as Simon Sor Suchart, is a Canadian-Jamaican Muay Thai kickboxer who competes in the light heavyweight and cruiserweight divisions.
 Born in Toronto of Jamaican descent, he took up Muay Thai at sixteen and achieved success as an amateur initially by medaling at three international tournaments as well as capturing the North American Cruiserweight Championship.
 Having turned professional in 2009, he had a breakout year in 2012 when he beat Kaoklai Kaennorsing for the WPMF World Light Heavyweight title and defeated Joe Schilling twice in a notable rivalry.
Joe Schilling
Joseph Francis "Joe" Schilling (January 13, 1984) is an American professional Muay Thai kickboxer and mixed martial artist who competes in the Super Middleweight and Light Heavyweight divisions of kickboxing and the Middleweight division of Bellator MMA.
 Known for his use of elbows to cut opponents and nicknamed "Stitch 'em Up", Schilling began fighting professionally in 2006 and was a two-time national titlist before defeating Kaoklai Kaennorsing to become the WBC Muaythai Interim World Light Heavyweight Champion in 2011.
 His profile further increased the following year when he engaged in a controversial rivalry with Simon Marcus.
Jordan Watson
Jordan Watson (born 4 December 1987) is an English Muay Thai kickboxer who competes in the middleweight division.
 A powerful kicker, Watson began training in Muay Thai at six years old with Richard Smith at Bad Company, Leeds, UK and first came to prominence when he reached the final of the "K-1 UK MAX Tournament 2007 Pain & Glory" at nineteen.
 He won the ISKA World Super Welterweight Muay Thai Championship in 2010 and then found further recognition the following year by finishing as runner-up on "The Challenger Muay Thai" reality television show.
 He began fighting for Glory in 2012.
 He is the first ever and current Yokkao -70 kg champion. Riku Immonen
Riku Immonen is a retired Finnish professional Muay Thai kickboxer and active muay thai coach.
 He is an amateur and professional Muay Thai World Champion.
 He trains fighters out of Turku Muay Thai.
 Most well known students are UFC fighter Makwan Amirkhani, Topi Helin and Daniel Forsberg.
 He trains also UFC fighter Teemu Packalen. Namphon Nongkee Pahuyuth
Namphon Nongkee Pahuyuth (Thai: นำพล หนองกี่พาหุยุทธ ; May 19, 1969 – September 19, 2016) was a former Thai Muay Thai kickboxer.
 He fought and was very famous in the 80s.
 In addition, he is also elder brother of another famous Muay Thai kickboxer Namkabuan Nongkeeprawayuth. Phon Martdee
Phon Martdee (born 17 May 1958 in Saraburi, Thailand) is a Thai-born Australian Muay Thai instructor, promoter and a former Muay Thai boxer.
 Martdee is one of the most well-known Muay Thai trainers in Australia, training over 30 champions of state, national and international status and having been voted Muay Thai Trainer of the Year by the International Kickboxer Magazine in 1997 and was president of the Thai-Australian Association of Western Australia in 2007-2008.
 He is currently the trainer of WBC Muay Thai Super Heavyweight National Champion Steve Bonner, Australian Champion Pamorn Martdee, WPMF Western Australian Champion Chris Garner, WBC Muay Thai Super Welterweight National Champion Jason Lea and top female prospect Melissa Norton. Mark DellaGrotte
Mark DellaGrotte (born November 14, 1974) is an American former professional Muay Thai kickboxer and a trainer in Muay Thai.
 He is the owner and operator of the Sityodtong USA Branch in Somerville, Massachusetts, and was certified and appointed by Master Yodtong to be recognized as an international conservator of Thai style boxing.
 Mark also has extensive training and is certified in the arts of Kali Escrima, Pencak Silat, Jeet Kune Do, Savate, and Brazilian Jiu-Jitsu. Dzianis Hancharonak
Dzianis Hancharonak (Belarusian: Дзянic Алегавiч Ганчаронак ; born June 21, 1988), sometimes spelt Denis Goncheronok, is a Belarusian heavyweight Muay Thai kickboxer fighting out of Minsk for Patriot Gym.
 He is a five-time amateur Muay Thai I.F.M.A world champion and holds a national degree of honored master of sports in Muay Thai.
 Inside the amateur ring, he enjoyed victories over notable athletes including: Nenad Pagonis, Franci Grajš, Simon Marcus and Vladimir Mineev. Yodtong Senanan
Yodtong Siriwalak (Thai: ยอดธง ศรีวราลักษณ์ ; 28 August 1937 – 8 February 2013) most commonly known by his Muay Thai ring name Yodtong Senanan (Thai: ยอดธง เสนานันท์) or Kru Tui (ครูตุ้ย or ครูตุ๊ย) was a Muay Thai fighter, trainer, and owner of the Sityodtong Muay Thai Camp in Chonburi, Thailand.
 He has produced 57 Muay Thai Champions, the most number in the history of Muay Thai in Thailand.
 His most famous Muay Thai World Champions include Samart Payakaroon, Kongtoranee Payakaroon, Nuengpichit Sityodtong, Detpitak Sityodtong, Chartchai Sityodtong, Yoddecha Sityodtong, Daotong Sityodtong, and others.
 Additionally, top Muay Thai, K-1, and UFC professional fighters from around the world such as Rob Kaman, Ramon Dekkers, Ernesto Hoost, Peter Aerts, Musashi, Kenny Florian, Antonio Braga Neto, and many others have made pilgrimage to the Sityodtong Gym in Pattaya to train and sharpen their skills.
 His top trainers include Saknarong Sityodtong, Daorung Sityodtong, Chatri Sityodtong, Yodsanan Sityodtong, Kongtoranee Sityodtong and others. Shane Campbell
Shane Darryl Campbell is a Canadian Welterweight Muay Thai kickboxer, mixed martial artist, and a former W.K.A. Muay Thai World Champion.
 Campbell is also the current WMA World Pro Muay Thai Champion, Aggression MMA World Champion, and Unified MMA World Champion.
 Campbell is by far one of the most decorated Muay Thai fighters in North America and is also current W.M.A. Muay Thai Middleweight World Champion.
 In MMA, Campbell currently competes in the Lightweight division of the Ultimate Fighting Championship.