The two Japanese fighters will headline a Teiken Promotions event at the Kokugikan, Tokyo.

The WBA championship status is far from ideal. Currently, Jesse "Bam" Rodriguez holds the WBA 'super' title, while Masuda is the regular champion. Tsutsumi was 'champion in recess', though is now listed as No. 1 contender.

Their rematch will go part of the way to clearing up the situation at 118 pounds. Tsutsumi, The Ring's No. 1 rated bantamweight, won his first five fights before two draws with then-unbeaten Kazuki Nakajima and Daigo Higa.

Tsutsumi (13-0-3, 8 KOs) went on to win Japanese honors and make four defenses, notably outpointing Masuda over 10 rounds in August 2023. The 30-year-old then upset Takuma Inoue over 12 rounds to win the WBA crown.

In his first defense, he was held to a 12-round draw in a Higa rematch before edging home a 12-round split decision despite a spirited Nonito Donaire display on December 17. Injury has sidelined him since then.

Masuda (11-1, 9 KOs), The Ring's No. 4-rated bantamweight, has moved quickly since debuting in 2022. He fell narrowly short against Tsutsumi 13 months after his first professional outing.

The 29-year-old southpaw puncher kicked on and picked up national honors before stepping onto the world stage with an eighth-round stoppage of Donaire on March 15. He outpointed Higa for the vacant WBA strap on July 20.

In the evening's chief support bout, Kenshiro Teraji (26-2, 16 KOs) makes the first defense of his WBO junior bantamweight title against Jassiel Amador (15-0-1, 13 KOs). Amador is the WBO's No. 10-rated contender.

Teraji, who sits third in The Ring's 115-pound rankings, won the WBC 108-pound title with a 12-round majority decision against Ganigan Lopez (MD 12).

A whopping eight defenses followed before a two-fight series with Masamichi Yabuki, where he would avenge his first stoppage defeat in March 2022. Teraji claimed The Ring and WBA belts with victory over previously-unbeaten Hiroto Kyoguchi (TKO 7) while further wins followed against Anthony Olascuaga (TKO9) and Hekkie Budler (TKO9).

He moved up to 112 pounds and stopped Cristofer Rosales for the vacant WBC title before adding the WBA strap with a 12th-round stoppage of Seigo Yuri Akui. He lost his titles last July via 12-round split decision to Ricardo Sandoval, a result prompting him to jump up in weight again where he outpointed Israel Gonzalez on March 20.

Amador turned professional in 2022 and has fought exclusively in Mexico.

The big-punching La Paz native has largely fought mediocre opposition. The 25-year-old has boxed twice this year, pitching decision wins over Pedro Delgado (UD10) in March and Jhovany Martinez (UD10) on July 18.

In a third world title fight David Jimenez (18-1, 12 KOs) will make his first appearance after being elevated to full WBA junior bantamweight champion. He faces a stern test against former WBA flyweight titlist Seigo Yuri Akui (23-3-1, 13 KOs), the sanctioning body's No. 2-rated contender.

Jimenez, No. 2 on The Ring's 115-pound rankings, turned professional in 2019. The 34-year-old lost a narrow 12-round decision against WBA flyweight titleholder Artem Dalakian in January 2023.

He returned strongly up a weight class at 115 pounds, besting John Ramirez over the distance to win WBA interim honors before a trip to Kyrgyzstan saw him stop Kenbun Torres in 11 rounds last July. Many fights have fallen by the wayside, though Bam Rodriguez's move up in weight saw Jimenez become full world champion for the first time.

Akui meanwhile was unbeaten through his first 12 fights before losing his unbeaten status against future three-weight titleholder Junto Nakatani (TKO6). He bounced back impressively, stopping future multi-weight world champion Yabuki in April 2018.

The 31-year-old claimed the Japanese flyweight title, went on to beat Dalakian for WBA honors and made two defenses before a 12th-round stoppage loss by Teraji. Since that setback, he's moved up in weight and won twice.