Ginjiro Shigeoka
Early life and amateur career. Ginjiro Shigeoka was born on 18 October 1999 in Kumamoto, Japan, where his family own a painting business. He has three siblings. His introduction to combat sports was through karate while in kindergarten. He began boxing at the Honda Fitness Boxing Gym at the age of 10, giving up karate two years later in order to focus on boxing. As an amateur he won five national titles and compiled a record of 56–1 (17 KOs). His only loss came to his older brother, Yudai Shigeoka. The brothers were scheduled to face each other  in the final of a domestic tournament but agreed not to fight, with Ginjiro's corner throwing in the towel as the bell rang to signal the start of the first round. Professional career. Shigeoka was scheduled to make his professional debut against Sanchai Yotboon on September 25, 2018. He won the fight by a third-round technical knockout. Shigeoka was awarded the East Japan Boxing Association September MVP award for this victory. Shigeoka was scheduled to face Gerttipong Kumsahwat on February 26, 2019. He won the fight by a first-round knockout, needing a little over a minute and  a half to finish his opponent. Shigeoka was next scheduled to fight Joel Lino on April 14, 2019. He extended his winning streak to three fights with a unanimous decision victory. Shigeoka was scheduled to face Clyde Azarcon for the vacant World Boxing Organisation Asia Pacific Minimumweight title on July 27, 2019. He won the fight by a first-round knockout, stopping Azarcon at the 1:12 minute mark. Shigeoka made the first defense of his WBO Asia Pacific title against Rey Loreto on December 31, 2019, on the undercard of the Kazuto Ioka and Jeyvier Cintrón WBO World Super Fly  title match. He won the fight by a fifth-round knockout. Shigeoka was scheduled to make his second title defense, following a 19 month absence from the sport, against the undefeated Toshiki Kawamitsu on July 14, 2021, in his first career main event. He won the fight by a second-round technical knockout. Shigeoka vacated the WBO Asia Pacific minumumweight title on August 4, 2021. Shigeoka was booked to face Tatsuro Nakashima on 27 March 2022, at the City Gym in Tomigusuku, Japan, for the vacant Japanese minimumweight title. He won the fight by unanimous decision, with scores of 99–91 , 99–91 and 98–92.