Introduction
Jonathan 'The General' Haggerty is the reigning ONE Bantamweight Kickboxing World Champion (since November 4, 2023), former ONE Bantamweight Muay Thai World Champion (April 2023 to September 2024), former ONE Flyweight Muay Thai World Champion (May 2019 to August 2019), and one of the best British Muay Thai fighters of his generation. The London-born technical Muay Thai specialist — Team Underground / Knowlesy Academy product, Millwall FC supporter, son of a Muay Thai-trainer father who taught him from age 7 — has built his championship-era credentials with the April 2023 ONE Fight Night 9 R1 KO of Nong-O Gaiyanghadao (ending Nong-O's 10-0 ONE promotional streak), the November 2023 ONE Fight Night 16 R2 KO of Fabricio Andrade for the vacant ONE Bantamweight Kickboxing World Title (becoming a rare two-sport, two-division ONE World Champion), and the April 29, 2026 ONE Samurai 1 unanimous-decision win over Yuki Yoza in his fifth ONE Bantamweight Kickboxing title defense. He is currently pursuing a three-sport ONE World Champion plan for 2026 — eyeing a Muay Thai bantamweight title fight against current champion Rambolek Chor Ajalaboon and a planned MMA debut.
Contents
Quick Stats
Background
Fighting Style
Career Highlights
Notable Fights & Rivalries
Championships & Accolades
Current Status
Fun Facts
Legacy / Verdict
Frequently Asked Questions
References
Quick Stats
Nickname: The General
Age: 29 (born February 18, 1997)
Height: 5'7" (170 cm)
Reach: 67" (170 cm)
Weight Class: Bantamweight (145 lb), formerly Flyweight (135 lb)
Stance: Orthodox
Team: Team Underground / Knowlesy Academy (London, UK)
Pro Combat Record: 21-5 (last fight ONE Samurai 1 April 29, 2026 — won title defense)
Background
Born February 18, 1997 in London, UK. Jonathan Haggerty grew up on Walworth Road in South London with a younger brother and two younger sisters. He learned Muay Thai from his father at age 7 and started competing as an amateur at age 12. He is a longtime supporter of his local football team Millwall FC and a foundational figure in modern British Muay Thai.
He turned professional in Muay Thai in 2014 at age 17 — winning his pro debut against Anthony Edwards by R4 TKO. He won his next four fights by stoppage before competing for the ISKA World Super-Featherweight Muay Thai title in April 2016 (won by R3 TKO over Gery Bavetta) and the WBC Muaythai Super Featherweight International title in May 2018 (won by R2 TKO over Isaac Araya). He made his ONE Championship debut at ONE: Eternal Glory in January 2019 and has built his championship-era credentials in ONE since. He trains at Team Underground / Knowlesy Academy in London under Christian Knowles. He resides in London with his family. His brother Freddie Haggerty serves as his cornerman alongside coach Christian Knowles.
Fighting Style
Technical British Muay Thai with elite-level striking precision and championship-pace pressure combined with kickboxing-tested adaptability. Haggerty's pattern is textbook Knowlesy Academy / Team Underground London — multi-style striking foundation combined with championship-level distance management and the highest-output striking output of his championship-era prime years. The April 2023 ONE Fight Night 9 R1 KO of Nong-O Gaiyanghadao (snapping a 10-0 ONE promotional streak by the Muay Thai legend), the November 2023 ONE Fight Night 16 R2 KO of Fabricio Andrade for the vacant ONE Bantamweight Kickboxing World Title, the February 2024 ONE Fight Night 19 R3 TKO defense over Felipe Lobo, and the April 29, 2026 ONE Samurai 1 unanimous-decision win over Yuki Yoza are the canonical examples of his championship-level fighting arsenal. He's earned three Performance of the Night bonuses in ONE Championship.
His weakness across his championship-era prime years has been against the most-elite-level Muay Thai finishers in ONE Championship history. The August 2019 ONE: Dawn of Heroes loss to Rodtang Jitmuangnon (lost ONE Flyweight Muay Thai title), the January 2020 ONE: A New Tomorrow R3 TKO loss to Rodtang in the rematch (knocked down three times in round three), the September 2024 ONE 168: Denver R1 49-second elbow KO loss to Superlek Kiatmuu9 (lost ONE Bantamweight Muay Thai title), and the early-career Yokkao 28 decision loss to Ja Kiatphontip and Yokkao 31 TKO loss to Superlek reflected variations of the same pattern. Within his championship-era prime years from April 2023 to April 2026, however, his arsenal has been the technical floor of ONE bantamweight kickboxing competition — multiple successful title defenses and the foundational two-sport ONE World Champion status.
Career Highlights
2014 — Pro Muay Thai debut vs Anthony Edwards. Won by R4 TKO.
April 15, 2016 — Muay Thai Mayhem vs Gery Bavetta. Won ISKA World Super-Featherweight Muay Thai title by R3 TKO.
May 26, 2018 — Muay Thai Mayhem vs Isaac Araya. Won WBC Muaythai Super Featherweight International title by R2 TKO.
January 19, 2019 — ONE Championship debut at ONE: Eternal Glory vs Joseph Lasiri. Won by unanimous decision.
May 4, 2019 — ONE: For Honor vs Sam-A Gaiyanghadao. Won ONE Flyweight Muay Thai World Championship by unanimous decision.
August 2, 2019 — ONE: Dawn of Heroes vs Rodtang Jitmuangnon. Lost ONE Flyweight Muay Thai title by unanimous decision.
January 10, 2020 — ONE: A New Tomorrow vs Rodtang Jitmuangnon 2. Lost by R3 TKO.
October 30, 2020 — ONE: Big Bang 2 vs Taiki Naito. Won by unanimous decision.
November 20, 2021 — Siam Warriors Superfights vs Arthur Meyer. Won ISKA Muay Thai Lightweight World title by R2 KO.
February 11, 2022 — ONE: Bad Blood vs Mongkolpetch Petchyindee Academy. Won by unanimous decision; Performance of the Night.
April 22, 2023 — ONE Fight Night 9 vs Nong-O Gaiyanghadao. Won ONE Bantamweight Muay Thai World Championship by R1 KO; ended Nong-O's 10-0 ONE streak.
November 4, 2023 — ONE Fight Night 16 vs Fabricio Andrade. Won vacant ONE Bantamweight Kickboxing World Title by R2 KO; became two-sport, two-division ONE World Champion.
February 16, 2024 — ONE Fight Night 19 vs Felipe Lobo. Title defense by R3 TKO; Performance of the Night.
September 6, 2024 — ONE 168: Denver vs Superlek Kiatmuu9. Lost ONE Bantamweight Muay Thai title by R1 49-second elbow KO.
February 20, 2025 — ONE 171: Qatar vs Wei Rui. Title defense by unanimous decision.
November 16, 2025 — Scheduled vs Nabil Anane at ONE 173 for Bantamweight Muay Thai title; withdrew due to shoulder injury during fight camp.
April 29, 2026 — ONE Samurai 1 vs Yuki Yoza. Title defense by unanimous decision; most recent fight.
Late 2026 — Eyeing ONE Bantamweight Muay Thai title fight against current champion Rambolek Chor Ajalaboon and MMA debut.
Notable Fights & Rivalries
vs Rodtang Jitmuangnon (ONE 2019, ONE 2020)
Haggerty's career-defining rivalry against the foundational 'Iron Man' Muay Thai legend Rodtang Jitmuangnon. He lost the first meeting at ONE: Dawn of Heroes on August 2, 2019 by unanimous decision — losing his ONE Flyweight Muay Thai World Championship in his first title defense after winning it from Sam-A Gaiyanghadao months earlier. The rematch at ONE: A New Tomorrow on January 10, 2020 ended with Rodtang's R3 TKO of Haggerty after Haggerty was knocked down three times in the third round. The two-fight series with Rodtang is widely cited as the foundational moment of Haggerty's championship-era resilience — defining the underdog pattern that would later produce his April 2023 R1 KO upset of Nong-O Gaiyanghadao.
vs Nong-O Gaiyanghadao (ONE Fight Night 9, 2023)
Haggerty's career-defining ONE Bantamweight Muay Thai title-winning fight. He stopped Nong-O Gaiyanghadao — the longtime ONE Bantamweight Muay Thai World Champion riding a 10-0 ONE promotional streak — by R1 KO at ONE Fight Night 9 on April 22, 2023 at the Lumpinee Boxing Stadium. The result was widely cited as one of the foundational upset wins in modern ONE Championship history and the moment that confirmed Haggerty as a true bantamweight title contender. After winning Haggerty famously shouted: 'Doubt me now.' Nong-O has subsequently competed in ONE 173 against Rodtang in November 2025.
vs Fabricio Andrade (ONE Fight Night 16, 2023)
Haggerty's two-sport, two-division ONE World Champion crowning fight. He stopped Fabricio 'Wonder Boy' Andrade — reigning ONE Bantamweight MMA World Champion — by R2 KO at ONE Fight Night 16 on November 4, 2023 in the Lumpinee Boxing Stadium. The result confirmed Haggerty as a rare two-sport ONE World Champion (Bantamweight Muay Thai + Bantamweight Kickboxing) and was widely cited as one of the most-replayed ONE bantamweight knockout finishes of 2023. Andrade has subsequently lost the ONE Bantamweight MMA World Title and competed elsewhere on the ONE roster.
vs Superlek Kiatmuu9 (Yokkao 31 2018, ONE 168: Denver 2024)
Haggerty's two-fight rivalry with Combat Press' #1 men's pound-for-pound Muay Thai fighter Superlek Kiatmuu9. The first meeting at Yokkao 31 in 2018 (which replaced a planned Liam Harrison fight) ended with Superlek's TKO win. The rematch at ONE 168: Denver on September 6, 2024 ended with Superlek's R1 49-second elbow KO of Haggerty — Joe Rogan reacted to the finish with the now-famous quote 'Oh my God perfect elbow.' The result cost Haggerty his ONE Bantamweight Muay Thai World Championship but he immediately rebounded by defending the ONE Bantamweight Kickboxing World Title against Wei Rui at ONE 171: Qatar in February 2025.
vs Yuki Yoza (ONE Samurai 1, 2026)
Haggerty's most-watched 2026 title defense. He defeated Japanese kickboxing star Yuki Yoza — riding a 13-bout winning streak with a Kyokushin karate-style devastating leg-kick arsenal — by unanimous decision at ONE Samurai 1 on April 29, 2026 in front of a Tokyo home crowd at Ariake Arena. Despite Yoza's calf-kick attack leaving Haggerty limping out of the cage with a wrapped left leg, Haggerty's veteran fight IQ secured the win in his fifth ONE Bantamweight Kickboxing World Championship defense. ONE CEO Chatri Sityodtong said after the fight: 'I love Jonathan and I'll support him with whatever dreams he has. If he wants to be a three-sport world champion, that would be incredible.'
Championships & Accolades
Reigning ONE Bantamweight Kickboxing World Champion (since November 4, 2023).
Former ONE Flyweight Muay Thai World Champion (May 2019 to August 2019).
Former ONE Bantamweight Muay Thai World Champion (April 2023 to September 2024).
Two-sport, two-division ONE World Champion (briefly, November 2023 to September 2024).
ISKA Muay Thai Lightweight World Champion (November 2021).
ISKA World Super-Featherweight Muay Thai Champion (April 2016).
WBC Muaythai Super Featherweight International Champion (May 2018).
Career career win over Muay Thai legend Nong-O Gaiyanghadao (ONE Fight Night 9 R1 KO, April 2023) — ended Nong-O's 10-0 ONE promotional streak.
Career career win over former Muay Thai legend Sam-A Gaiyanghadao (ONE: For Honor UD, May 2019).
Career career win over former ONE Bantamweight MMA World Champion Fabricio Andrade (ONE Fight Night 16 R2 KO, November 2023).
Multiple ONE Performance of the Night winner (Mongkolpetch, Felipe Lobo).
Pro combat record: 21-5 across 12-year career (2014-present).
One of the best British Muay Thai fighters of his generation.
Foundational figure in modern British Muay Thai's mainstream-television breakthrough era.
Current Status
Active in ONE Championship. Haggerty's most recent fight was the April 29, 2026 unanimous-decision win over Yuki Yoza at ONE Samurai 1 at Ariake Arena in Tokyo — successfully defending his ONE Bantamweight Kickboxing World Championship in front of a Japanese home crowd. He earned a glowing endorsement from ONE chairman and CEO Chatri Sityodtong: 'I love Jonathan and I'll support him with whatever dreams he has. If he wants to be a three-sport world champion, that would be incredible.'
He is currently pursuing a three-sport ONE World Champion plan for 2026: a return to Muay Thai for the ONE Bantamweight Muay Thai World Title against current champion Rambolek Chor Ajalaboon (who upset Nabil Anane to claim the title in March 2026), plus a planned MMA debut later in the year. Speaking after ONE Samurai 1 he said: 'Obviously, I'd like to fight for the Muay Thai World Title against Rambolek. That's on my mind as well. But also MMA. That's definitely something I'd like to do. I'm a martial artist, so I'll give it a go for sure.' He posted on Instagram on December 31, 2025: 'I want the other two belts in ONE Championship Muay Thai and MMA.' He continues to train at Team Underground / Knowlesy Academy in London under coach Christian Knowles. He resides in London with his family. He is widely cited as one of the foundational figures in modern British Muay Thai's mainstream-television breakthrough era.
Fun Facts
Learned Muay Thai from his father at age 7 — and started competing as an amateur at age 12, making him one of the youngest competitive starters in modern British Muay Thai.
Grew up on Walworth Road in South London with a younger brother and two younger sisters — and is a longtime supporter of his local football team Millwall FC.
His nickname 'The General' reflects his championship-era leadership presence and the foundational role he plays in modern British Muay Thai's mainstream-television breakthrough era.
Famously shouted 'Doubt me now' after his April 2023 ONE Fight Night 9 R1 KO of Nong-O Gaiyanghadao — ending Nong-O's 10-0 ONE promotional streak in one of the foundational upset wins in modern ONE Championship history.
Was a two-sport, two-division ONE World Champion (Bantamweight Muay Thai + Bantamweight Kickboxing) from November 2023 to September 2024 — making him one of only a handful of fighters to hold ONE World Championships in two different sports simultaneously.
Stopped former ONE Bantamweight MMA World Champion Fabricio 'Wonder Boy' Andrade by R2 KO at ONE Fight Night 16 on November 4, 2023 — making him one of only a handful of strikers to stop a then-current ONE Bantamweight MMA Champion in the Circle.
Got endorsement from ONE CEO Chatri Sityodtong after his April 29, 2026 ONE Samurai 1 win: 'I love Jonathan and I'll support him with whatever dreams he has. If he wants to be a three-sport world champion, that would be incredible.'
Plans his MMA debut in 2026 — making him one of the most-watched striking-to-MMA crossover prospects in modern ONE Championship history.
His brother Freddie Haggerty serves as his cornerman alongside coach Christian Knowles — making the Haggerty corner one of the most-watched family-coaching units in modern Muay Thai.
Legacy / Verdict
Jonathan 'The General' Haggerty is one of the best British Muay Thai fighters of his generation and a foundational figure in modern British Muay Thai's mainstream-television breakthrough era. The May 2019 ONE: For Honor unanimous-decision win over Sam-A Gaiyanghadao to win the ONE Flyweight Muay Thai World Championship, the April 2023 ONE Fight Night 9 R1 KO of Nong-O Gaiyanghadao to win the ONE Bantamweight Muay Thai World Championship (ending Nong-O's 10-0 ONE promotional streak), the November 2023 ONE Fight Night 16 R2 KO of Fabricio Andrade for the vacant ONE Bantamweight Kickboxing World Championship (becoming a rare two-sport, two-division ONE World Champion), the multiple successful title defenses across his championship-era prime years (Felipe Lobo, Wei Rui, Yuki Yoza), the multiple ISKA and WBC Muay Thai world titles, the 21-5 career combat record across 12 years, and the foundational father-son Muay Thai-from-age-7 family origin story together place him in the conversation for greatest British Muay Thai fighter of his generation and the foundational figure in ONE Championship's bantamweight golden era.
What complicates the legacy is the post-2024 stretch — the September 2024 ONE 168: Denver R1 49-second elbow KO loss to Superlek Kiatmuu9 (cost him the ONE Bantamweight Muay Thai title), the November 2025 ONE 173 withdrawal due to shoulder injury during fight camp (missed his rebooked Bantamweight Muay Thai title rematch with Nabil Anane), and the still-pursuing three-sport ONE World Champion plans for 2026 against current ONE Bantamweight Muay Thai Champion Rambolek Chor Ajalaboon and his planned MMA debut. The competitive resume is permanent and the championship-era prime years are settled. The legacy as one of the best British Muay Thai fighters of his generation is permanent — and the May 2026 'doubt me now' redemption arc is the latest chapter in one of the most-watched modern British Muay Thai careers.
Frequently Asked Questions
Is Jonathan Haggerty the ONE Bantamweight Kickboxing World Champion?
Yes — he is the reigning ONE Bantamweight Kickboxing World Champion. He won the title at ONE Fight Night 16 on November 4, 2023 by R2 KO over Fabricio 'Wonder Boy' Andrade and has successfully defended it three times: against Wei Rui at ONE 171: Qatar (UD, February 2025) and against Yuki Yoza at ONE Samurai 1 (UD, April 29, 2026). He is currently eyeing both a potential MMA debut and a return to Muay Thai for a third belt.
What is Jonathan Haggerty's combat sports record?
Twenty-one wins and five losses across his 12-year career from 2014 to present. He is widely considered one of the best British Muay Thai fighters of his generation. His major Muay Thai title wins include the ISKA World Super-Featherweight Muay Thai title (2016), the WBC Muaythai Super Featherweight International title (2018), the ISKA Muay Thai Lightweight World title (2021), the ONE Flyweight Muay Thai World Championship (2019), and the ONE Bantamweight Muay Thai World Championship (April 2023).
Was Haggerty a two-sport ONE Champion?
Yes — he held the ONE Bantamweight Muay Thai World Championship (April 2023 to September 2024) and the ONE Bantamweight Kickboxing World Championship (since November 2023) simultaneously, making him a rare two-sport ONE World Champion. He lost the bantamweight Muay Thai title to Superlek Kiatmuu9 by R1 49-second elbow KO at ONE 168: Denver in September 2024 but retains the kickboxing title to this day. He is currently pursuing a third belt — eyeing a Muay Thai bantamweight rematch against Rambolek Chor Ajalaboon and an MMA debut in 2026.
What style does Jonathan Haggerty fight?
Technical British Muay Thai with elite-level striking precision and championship-pace pressure combined with kickboxing-tested adaptability. Haggerty's pattern is textbook Knowlesy Academy / Team Underground London — multi-style striking foundation combined with championship-level distance management and the highest-output striking output of his championship-era prime years. The April 2023 ONE Fight Night 9 R1 KO of Nong-O Gaiyanghadao, the November 2023 ONE Fight Night 16 R2 KO of Fabricio Andrade for the vacant ONE Bantamweight Kickboxing World Title, and the April 29, 2026 ONE Samurai 1 unanimous-decision win over Yuki Yoza are the canonical examples of his championship-level fighting arsenal.
Where is Jonathan Haggerty from?
Born February 18, 1997 in London, UK. Haggerty grew up on Walworth Road, London — in South London — with a younger brother and two younger sisters. He learned Muay Thai from his father at age 7 and started competing as an amateur at age 12. He is a supporter of his local football team Millwall FC. He trains at Team Underground / Knowlesy Academy in London under Christian Knowles. He resides in London with his family.
What's next for Jonathan Haggerty?
He successfully defended the ONE Bantamweight Kickboxing World Title against Yuki Yoza at ONE Samurai 1 on April 29, 2026 by unanimous decision. He has stated he wants to fight for the ONE Bantamweight Muay Thai World Title against current champion Rambolek Chor Ajalaboon (who upset Nabil Anane to claim the title in March 2026) — and is also openly planning his MMA debut in 2026. Speaking after ONE Samurai 1 he said: 'Obviously, I'd like to fight for the Muay Thai World Title against Rambolek. That's on my mind as well. But also MMA. That's definitely something I'd like to do. I'm a martial artist, so I'll give it a go for sure.' He posted on Instagram on December 31, 2025: 'I want the other two belts in ONE Championship Muay Thai and MMA' — chasing three-sport ONE World Champion status.
References
Wikipedia — Jonathan Haggerty career overview
ONE Championship — Jonathan 'The General' Haggerty athlete profile
ONE Championship — Haggerty derails Yoza's rise, eyes Muay Thai gold and MMA debut (May 2026)