Earlier this week, news broke of a world title doubleheader in Yokohama, Japan, on May 28.

The Ohashi Promotions event will see Eduardo Nunez and Masanori Rikiishi contest the vacant IBF junior lightweight title and Yoshiki Takei put his WBO bantamweight title on the line against unbeaten Yuttapong Tongdee at the Yokohama Buntai.

Nunez had been the IBF mandatory challenger to Anthony Cacace, who ultimately decided to vacant in favor of facing Leigh Wood, in a more lucrative clash on May 10. That left the door open for Nunez to face Rikiishi to fill the vacancy.

Meanwhile, Takei had been due to face Tongdee on the undercard of Ring/ undisputed junior featherweight titleholder Naoya Inoue-Sam Goodman on December 24. However, the promotion was postponed when Goodman suffered a cut. The two had been tabbed to then fight on January 24 only for Takei to tear a cartilage in his right shoulder.

Rikiishi (16-1, 11 knockouts), who is the younger brother of IBF junior flyweight champion Masamichi Yabuki, turned professional in 2017, he lost his third fight against future OPBF 130-pound beltholder Kosuke Saka (TKO 2). After several wins, he claimed the OPBF title by besting the experienced Tukuya Watanabe (UD 12). After one defense he stepped into international class beating Ricardo Nunez (KO 3).

The 30-year-old southpaw traveled to Italy and was behind on all three scorecards before rallying to stop Michael Magnesi in an instant classic with less than 30 seconds left in the fight. He has had one stay busy fight since.

Nunez (27-1, 27 KOs), rated at No. 7 by The Ring at junior lightweight, toiled in near anonymity in Mexico for several years, winning all bar one his fights - a loss to Hiram Gallardo (UD 6) - inside the distance with only three opponents getting past the sixth round.

The 27-year-old punchers big break came when he went to Tajikistan and stopped iron-jawed Shavkatzhon Rakhimov (TKO 11). The Los Mochis native has since beat up and stopped faded but still serviceable former title challenger Miguel Marriaga (TKO 6).

Takei (10-0, 8 KOs), rated at No. 4 by The Ring at bantamweight, was a very successful K1 career before coming to boxing in 2021. In just his fifth outing he won the OPBF junior featherweight title and made one defense before dropping to bantamweight.

After two bouts, he landed a shot at Jason Moloney's WBO title. The 28-year-old southpaw raced out into an early lead and held off the spirited Australian late on to claim the title via 12-round unanimous decision. In his first defense he edged home against former WBC flyweight titlist Daigo Higa (UD 12).

Tongdee (15-0, 9 KOs) fought Internationally as an amateur in Cuba, Kazakhstan and Spain for Thailand before turning professional in 2020.

The 31-year-old has since defeated in modest company, with all 15 fights taking place at home in Thailand.