Junto Nakatani rose from a Los Angeles gym to world titles in three weight classes

Junto Nakatani left Japan as a teenager, learned his trade in the gyms of Los Angeles and came back to win world titles at flyweight, super flyweight and bantamweight. He was unbeaten through 32 professional fights. In May 2026 he finally lost a close decision to Naoya Inoue in front of a sold-out Tokyo Dome, and it was one of the biggest nights Japanese boxing has seen.

A Karate Pupil From Mie Prefecture

Junto Nakatani was born on 2 January 1998 in Inabe, a small city in Mie Prefecture, according to his Wikipedia biography. The Ring has listed him as being from Kanagawa, which is probably where he has been based as a professional rather than where he was born. As a primary school boy he spent so many hours on video games that his father enrolled him in karate in the third grade. Before long he moved to boxing, and the sport's weight classes helped him. A tall, slim child had a fairer chance there than in open-weight contests.

His amateur career was short but successful. He won the national under-15 championship, and Wikipedia gives his amateur record as 14 wins, 10 of them inside the distance, against two defeats. That national title shaped what came next. Japanese outlet Friday Digital reports that he decided not to go to high school because he wanted to become a professional world champion.

Growing Up in the Gyms of Los Angeles

At 15, Friday Digital reports, Nakatani travelled alone to the United States. Other accounts put him at 14, and The Ring has dated his time in Southern California to 2013. In Los Angeles he met Rudy Hernandez. Hernandez had trained his late brother, Genaro Hernandez, and had worked with Japanese fighters before. He agreed to take the boy on after watching him box. Nakatani lived in the house of Hernandez's father in South Central Los Angeles and often did around 20 rounds of gym work a day, with roadwork on top.

That partnership has lasted his whole career. In April 2026 The Ring described Hernandez as having guided Nakatani for close to 15 years, and the trainer was still in his corner for the biggest fight of his life. American sparring, American coaching and the discipline of living far from home made the southpaw an unusual figure among Japanese prospects. He was 173 centimetres tall with a reach of about 174 centimetres, unusually long levers for the lighter divisions, and he had a puncher's instincts.

Professional Debut and the Japanese Flyweight Title

Nakatani turned professional at 17. His debut came on 26 April 2015 at the Industrial Hall in Gifu, where he stopped Junichi Itoga in the first round. He kept winning and kept stopping people. On 2 February 2019 he boxed Naoki Mochizuki at Korakuen Hall in Tokyo for the vacant Japanese flyweight title and won by ninth-round technical knockout. He gave up that belt in July 2019 to aim higher.

WBO Flyweight Champion

His world title chance came during the pandemic. On 6 November 2020, again at Korakuen Hall, he met Giemel Magramo for the vacant WBO flyweight title. Nakatani stopped him in the eighth round to become a world champion at 22. His first defence took him to the Casino del Sol in Tucson, Arizona, on 10 September 2021, where he stopped Angel Acosta in the fourth round. On 9 April 2022 he returned to Japan and stopped Ryota Yamauchi in the eighth round at Saitama Super Arena.

Making 112 pounds was getting harder for a fighter of his height. On 1 November 2022 he moved up to super flyweight and outpointed Francisco Rodriguez Jr. over ten rounds in Saitama.

The Moloney Knockout and a Second World Title

On 20 May 2023 Nakatani fought Andrew Moloney at the MGM Grand Garden Arena in Las Vegas for the vacant WBO junior bantamweight title. It produced the most famous single punch of his career. With the fight in its last minute, Nakatani knocked Moloney out at 2:42 of the twelfth and final round. The Ring named it its Knockout of the Year for 2023, and ESPN, CBS Sports and other outlets gave it similar awards.

His only defence at 115 pounds went the full distance. On 18 September 2023 at Ariake Arena in Tokyo, Argi Cortes took him through twelve rounds, and Nakatani won a unanimous decision. He then moved up again.

Bantamweight Rule at Ariake Arena

On 24 February 2024 at the Ryogoku Kokugikan, the sumo hall in Tokyo, Nakatani challenged Alexandro Santiago for the WBC bantamweight title. He stopped him in the sixth round and became a champion in a third weight class. The title defences after that were mostly quick. Vincent Astrolabio lasted less than one round at the Kokugikan on 20 July 2024. Petch Sor Chitpattana was stopped in the sixth at Ariake Arena on 14 October 2024. On 24 February 2025 at the same venue, David Cuellar Contreras was knocked out in the third.

Next came a unification. On 8 June 2025 at the Ariake Colosseum, Nakatani faced fellow Japanese fighter Ryosuke Nishida, who held the IBF belt, with the vacant Ring Magazine championship also at stake. Nishida's corner retired him after the sixth round because of an eye injury. That left Nakatani holding the WBC, IBF and Ring bantamweight titles. Two months later, on 6 August 2025, he announced that he would move up to super bantamweight. The sanctioning bodies declared his belts vacant in September 2025.

Super Bantamweight and the Naoya Inoue Showdown

Nakatani made his debut at 122 pounds on 27 December 2025 at the Mohammed Abdo Arena in Riyadh, Saudi Arabia. It was the co-main event of The Ring's "Night of the Samurai" card. Sebastian Hernandez, then unbeaten, made him work for twelve rounds. The judges scored it 118-110, 115-113 and 115-113 for Nakatani, and The Ring reported his record as 32-0 with 24 knockouts. Even before that fight, a meeting with undisputed super bantamweight champion Naoya Inoue was being discussed. Early reports aimed at 3 May, and the fight was later set for 2 May 2026.

It took place at the Tokyo Dome before about 55,000 people. Boxing Insider described it as the largest all-Japanese boxing event ever staged. Inoue controlled the opening rounds with his jab, his feet and his body punching. Nakatani grew into the fight from the sixth and had his strongest spells in the eighth and ninth rounds, when his combinations backed the champion up. Late in the tenth round a clash of heads opened a cut over his left eye. Inoue took the eleventh and twelfth to win a unanimous decision. Two judges scored it 116-112 and the third 115-113. There were no knockdowns.

Afterwards Nakatani cut his press conference short with a suspected fracture of the left orbital bone. Accounts of the cause differ. His Wikipedia entry attributes the fracture to an uppercut in the eleventh round. Boxing Social reported that Hernandez confirmed the orbital injury but said it was not yet clear whether a punch or the head clash had caused it. Later reports said surgery could push any rematch back into 2027.

Professional Record and Titles Won

As of the Tokyo Dome result reported on 2 May 2026, which is also the last fight on his Wikipedia record, Junto Nakatani's professional record stands at 32 wins and 1 loss, with no draws. Twenty-four of his wins came by knockout or stoppage and eight on points. The only defeat is the decision against Naoya Inoue. No later fight had been reported in the sources consulted when this article was written in November 2026.

Titles won as a professional:

• Japanese flyweight title (2019)
• WBO flyweight title (2020, two defences)
• WBO junior bantamweight (super flyweight) title (2023, one defence)
• WBC bantamweight title (2024, four defences)
• IBF bantamweight title (2025)
• The Ring bantamweight championship (2025)

He won world titles in three divisions and gave up his bantamweight belts unbeaten. He also won The Ring's 2023 Knockout of the Year. At 28 he remains one of the leading names in the lighter weights, with recovery from the eye injury and a possible rematch with Inoue still to come.

Sources

• Junto Nakatani, Wikipedia, accessed 14 November 2026
• Junto Nakatani beats Sebastian Hernandez, The Ring (Tom Gray), 27 December 2025
• Rudy Hernandez says Nakatani couldn't be more prepared to challenge Inoue, The Ring (Manouk Akopyan), 27 April 2026
• Inoue outpoints Nakatani by unanimous decision at Tokyo Dome, Boxing Insider, 2 May 2026
• Rudy Hernandez confirms orbital injury for Junto Nakatani after loss to Naoya Inoue, Boxing Social (Carlos Linares), 3 May 2026
• 2-weight champ Jyunjin Nakatani in the area of LA where he started out, Friday Digital, 1 September 2023