On February 24, 2024, a 26-year-old Riku Masuda (3-1, 3 KOs) and a 32-year-old Filipino boxer Jonas Sultan (19-6, 10 KOs) met in the ring in a bantamweight bout.
Masuda came in to the fight on a 1-fight losing streak with a 75% KO rate, and was fighting after a gap of 5 months and 25 days. Sultan was on a 1-fight win streak with a 40% KO rate, and fighting after a layoff of 5 months and 18 days.
Riku Masuda stopped Jonas Sultan via KO in the 1st round. Masuda improves his record to 4-1 (4 KOs), while Sultan adds a loss to his record at 19-7.
On December 3, 2022, a 25-year-old Riku Masuda (1-0, 1 KO) and Jeong Ho An met in the ring.
Masuda came in to the fight on a 1-fight win streak with a 100% KO rate, and was fighting after a gap of 5 months and 1 day.
Riku Masuda stopped Jeong Ho An via KO in the 1st round. Masuda improves his record to 2-0 (2 KOs)
On May 20, 2023, a 25-year-old Riku Masuda (2-0, 2 KOs) and Fumiya Fuse met in the ring.
Masuda came in to the fight on a 2-fight win streak with a 100% KO rate, and was fighting after a gap of 5 months and 17 days.
Riku Masuda stopped Fumiya Fuse via TKO in the 7th round. Masuda improves his record to 3-0 (3 KOs)
On August 30, 2023, a 25-year-old Riku Masuda (3-0, 3 KOs) and a 27-year-old fellow Japanese boxer Seiya Tsutsumi (8-0-2, 7 KOs) met in the ring.
Masuda came in to the fight on a 3-fight win streak with a 100% KO rate, and was fighting after a gap of 3 months and 10 days. Tsutsumi was on a 3-fight win streak with a 70% KO rate, and fighting after a layoff of 5 months and 10 days.
Seiya Tsutsumi defeated Riku Masuda via unanimous decision in the 10-round bantamweight fight. Tsutsumi improves his record to 9-0-2, while Masuda adds a loss to his record at 3-1.
On July 2, 2022, a 24-year-old Riku Masuda (debutant) and Worraphon Yothika met in the ring.
Riku Masuda stopped Worraphon Yothika via KO in the 1st round, making a successful professional debut. Masuda advances his record to 1-0 (1 KO)