Nonito Donaire walked into Yokohama Budokan as a 43-year-old legend with 43 professional fights behind him. He walked out with another loss on his record — stopped in round 8 by the younger, sharper Riku Masuda in a WBA Bantamweight final eliminator that was never close.
All three ringside judges had Masuda comfortably ahead on every card when the finish came. The scorecards read 64-67, 63-68, 63-68 at the point of stoppage — every official scoring the fight for the Japanese prospect. This wasn’t a controversial stoppage of a tight fight. It was the confirmation of what the numbers had been quietly suggesting for the better part of three years.
Riku Masuda def. Nonito Donaire KO — Round 8 📍 Yokohama Budokan, Yokohama, Japan | Sunday, 15 March 2026 WBA World Bantamweight Final Eliminator (118 lbs) — 10 rounds scheduled | U Next Boxing 5
64-67, 63-68, 63-68 for Masuda after seven rounds. That’s the equivalent of five or six rounds to one or two on each judge’s card. This is the critical data point: the stoppage in round 8 didn’t gift Masuda the victory — the points were already settled. He finished a fight he was already winning decisively.
That matters for interpreting the performance. Some stoppage finishes flatter the winner, catching a tired opponent late in a close contest. This was different. Masuda built an insurmountable lead and then applied the finish. The data tells the story of total control.
The Tale of the Tape makes the narrative visceral:
| Masuda | Donaire | |
|---|---|---|
| Record (after) | 9-1 | 43-9 |
| Age | 28 | 43 |
| Nationality | 🇯🇵 Japan | 🇵🇭 Philippines |
| Height | 5’6” / 168cm | 5’5” / 166cm |
| Reach | 69.7” / 177cm | 68.1” / 173cm |
| Stance | Southpaw | Orthodox |
| Debut | 2022 | 2001 |
| Pro Rounds | ~30 | 320 |
Donaire debuted professionally in 2001 — when Masuda was four years old. He has fought 320 professional rounds across five weight divisions. He stopped Vic Darchinyan in 2007. He had two of the decade’s great bantamweight battles with Naoya Inoue. He won world titles at super bantamweight, bantamweight, featherweight, and super featherweight. His career is, by any measure, a hall-of-fame achievement.
And tonight, in front of a home crowd backing Masuda, those 320 rounds of accumulated wear counted against him. Masuda’s height edge, his longer reach, and the constant structural problem posed by his southpaw stance gave Donaire no angles he hadn’t been struggling with for years. By the middle rounds, the right hooks were landing with worrying frequency.
If the result was a shock to the casual viewer, the form data had been signalling it for some time:
| Date | Opponent | Result |
|---|---|---|
| Dec 2025 | Seiya Tsutsumi | L SD12 — WBA title shot |
| Jun 2025 | Andres Campos | W UD12 |
| Jul 2023 | Alejandro Santiago | L UD12 — WBO title eliminator |
| Jun 2022 | Naoya Inoue II | L TKO2 — undisputed title |
| Dec 2021 | Reymart Gaballo | W KO4 — WBC title |
Three losses in his last four fights before tonight. The Tsutsumi split-decision defeat in December — against a Japanese domestic-level champion — should have been the clearest signal. Even when Donaire wins, his margin of victory has narrowed against the quality he’s facing. The 43-year-old body simply doesn’t recover between shots the way it once did.
Masuda came in with back-to-back wins — TKO1 over Michell Banquez (June 2025) and UD10 over Jose Calderon Cervantes (November 2025). His pre-fight record of 8-1 may not feature marquee names, but tonight’s performance showed a fighter already operating at a level above his record suggests.
The reach advantage of nearly two inches, combined with his southpaw stance, gave him a consistent structural edge. He controlled the jab range throughout, stayed composed as Donaire sought desperate openings, and when the finishing opportunity arrived in round 8, he took it cleanly.
He is now the WBA’s mandatory challenger at bantamweight. The world title fight is next.
For Masuda, this is a launching pad. A WBA bantamweight world title shot awaits, against opposition that will provide a genuine examination of where his ceiling sits. On tonight’s evidence, he’s ready for that test.
For Donaire, the harder conversation follows. At 43, with four losses in his last five fights, the record makes the case for retirement — loudly. There is nothing left to prove. He has been the sport’s consummate professional for 25 years, a five-weight world champion, a two-time Fighter of the Year. The sport does not need to take anything more from him. That decision, ultimately, belongs to him alone.
Also on the card at Yokohama Budokan: Anthony Olascuaga retained the WBO World Flyweight title with a dominant round 9 TKO of Jukiya Iimura — every judge had him winning every round at the stoppage.
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