On May 6, 2015, the 28-year-old WBA light-flyweight world champion, Ryoichi Taguchi (21-2-1, 8 KOs), faced a 30-year-old Thai boxer Kwanthai Sithmorseng (47-3-1, 25 KOs), in a title defense fight.
Taguchi came in to the fight on a 3-fight win streak with a 33% KO rate, and was fighting after a gap of 4 months and 6 days. Sithmorseng was on a 3-fight win streak with a 49% KO rate, and fighting after a layoff of 3 months.
Ryoichi Taguchi stopped Kwanthai Sithmorseng via TKO in the 8th round of the 12-round world-title fight, and successfully defended his WBA light-flyweight title. Taguchi improves his record to 22-2-1 (9 KOs), while Sithmorseng adds a loss to his record at 47-4-1.
On December 31, 2017, the 31-year-old WBA (Unified) light-flyweight champion, Ryoichi Taguchi (26-2-2, 12 KOs), and the 29-year-old IBF light-flyweight champion Milan Melindo (37-2, 13 KOs) met in a title-unification fight.
Taguchi came in to the fight on a 1-fight win streak with a 40% KO rate, and was fighting after a gap of 5 months and 8 days. Melindo was on a 5-fight win streak with a 33% KO rate, and fighting after a layoff of 3 months and 15 days.
Ryoichi Taguchi defeated Milan Melindo via unanimous decision and unifies the WBA (Unified), IBF, and The Ring light-flyweight titles. Taguchi improves his record to 27-2-2, while Melindo adds a loss to his record at 37-3.
On April 27, 2016, the 29-year-old WBA light-flyweight world champion, Ryoichi Taguchi (23-2-1, 10 KOs), faced Juan Jose Landaeta, in a title defense fight.
Taguchi came in to the fight on a 5-fight win streak with a 38% KO rate, and was fighting after a gap of 3 months and 27 days.
The challenger refused to continue the fight in the 11th round, and Ryoichi Taguchi is crowned the new light-flyweight world champion. Taguchi improves his record to 24-2-1 (11 KOs)
On July 23, 2017, the 30-year-old WBA light-flyweight world champion, Ryoichi Taguchi (25-2-2, 11 KOs), faced Robert Barrera, in a title defense fight.
Taguchi came in to the fight after a draw in his last fight with a 37% KO rate, and was fighting after a gap of 6 months and 23 days.
Ryoichi Taguchi stopped Robert Barrera via TKO in the 9th round of the 12-round world-title fight, and successfully defended his WBA light-flyweight title. Taguchi improves his record to 26-2-2 (12 KOs)
On December 31, 2015, the 29-year-old WBA light-flyweight world champion, Ryoichi Taguchi (22-2-1, 9 KOs), faced Luis de la Rosa, in a title defense fight.
Taguchi came in to the fight on a 4-fight win streak with a 36% KO rate, and was fighting after a gap of 7 months and 25 days.
The challenger refused to continue the fight in the 9th round, and Ryoichi Taguchi is crowned the new light-flyweight world champion. Taguchi improves his record to 23-2-1 (10 KOs)
On August 31, 2016, the 29-year-old WBA light-flyweight world champion, Ryoichi Taguchi (24-2-1, 11 KOs), faced Ryo Miyazaki, in a title defense fight.
Taguchi came in to the fight on a 6-fight win streak with a 40% KO rate, and was fighting after a gap of 4 months and 4 days.
Ryoichi Taguchi defeated Ryo Miyazaki via unanimous decision and successfully defended his WBA light-flyweight title. Taguchi improves his record to 25-2-1
On December 31, 2014, a 28-year-old Ryoichi Taguchi (20-2-1, 8 KOs) got a shot at the WBA light-flyweight title held by Alberto Rossel.
Taguchi came in to the fight on a 2-fight win streak with a 34% KO rate, and was fighting after a gap of 5 months and 26 days.
Ryoichi Taguchi defeated Alberto Rossel via unanimous decision and wins the WBA title — in his first world-title fight. Taguchi improves his record to 21-2-1
On December 31, 2016, the 30-year-old WBA light-flyweight world champion, Ryoichi Taguchi (25-2-1, 11 KOs), faced a 23-year-old Venezuelan boxer Carlos Cañizales (16-0, 13 KOs), in a title defense fight.
Taguchi came in to the fight on a 7-fight win streak with a 39% KO rate, and was fighting after a gap of 4 months. Cañizales was on a 16-fight win streak with a 81% KO rate, and fighting after a layoff of 2 months and 30 days.
The fight ended in a split decision draw and both the fighters added a draw to their respective records — Taguchi is now 25-2-2 and Cañizales, 16-0-1.
On March 16, 2019, a 32-year-old Ryoichi Taguchi (27-3-2, 12 KOs) got a shot at the flyweight WBO title held by 23-year-old fellow Japanese boxer Kosei Tanaka (12-0, 7 KOs).
Taguchi came in to the fight on a 1-fight losing streak with a 37% KO rate, and was fighting after a gap of 9 months and 24 days. Tanaka was on a 12-fight win streak with a 58% KO rate, and fighting after a layoff of 5 months and 20 days.
Kosei Tanaka defeated Ryoichi Taguchi via unanimous decision and successfully defended his WBO flyweight title. Tanaka improves his record to 13-0, while Taguchi adds a loss to his record at 27-4-2.
On October 15, 2011, a 24-year-old Ryoichi Taguchi (15-1, 6 KOs) and Yu Kimura met in the ring.
Taguchi came in to the fight on a 6-fight win streak with a 37% KO rate, and was fighting after a gap of 3 months and 10 days.
Ryoichi Taguchi stopped Yu Kimura via TKO in the 6th round. Taguchi improves his record to 16-1 (7 KOs)