Rene Santiago Outpoints Masataka Taniguchi To Retain WBA & WBO Titles

There is something almost theatrical about the setting of Korakuen Hall. Tucked into the Tokyo skyline, intimate by the standards of world title boxing, perpetually crackling with the sort of partisan energy that smaller venues preserve far better than the vast arenas of Las Vegas or Riyadh, it has staged so many defining moments in the sport's lower weight classes that its walls carry a kind of institutional memory. On Friday evening, it witnessed yet another chapter, as Puerto Rico's René "El Chulo" Santiago retained his unified WBA and WBO light flyweight titles with a unanimous decision over Japan's Masataka Taniguchi, the judges returning scores of 115-113, 116-112, and 117-110 after twelve testing rounds.

The result extended Santiago's remarkable run in Japan to three wins from three visits, a record that no travelling fighter achieves by accident. He arrived in Tokyo having upset Shokichi Iwata in March 2025 to claim the WBO belt, returned in December to outpoint Kyosuke Takami by split decision and add the WBA version to his collection, and now, against a domestic challenger with genuine credentials and the appetite of a man with something personal at stake, he delivered once again. It was not always comfortable viewing. It rarely is with Santiago. But by the final bell, it was emphatically convincing, and the 33-year-old from Humacao can now count himself among the most intriguing operators in the lower weight divisions anywhere in the world.

Santiago entered this defence bearing the additional weight of historical context. With the victory, he joined Xander Zayas and Oscar Collazo as the third Puerto Rican to hold a unified world title, a distinction that carries obvious significance for an island where boxing runs deep in its cultural marrow. That he achieved it on foreign soil, in a country where neither of his title wins had made him the popular favourite, only adds to the achievement's credibility.

Taniguchi was no ordinary challenger, and it would be a disservice to him to suggest otherwise. The 32-year-old southpaw from Tokyo had held the WBO minimumweight title, stopping Wilfredo Mendez in eleven rounds in 2021 and defending it against Kai Ishizawa before suffering a brutal second-round stoppage loss to Melvin Jerusalem in 2023. That defeat cost him the belt and, temporarily at least, his position among the elite. He had rebuilt patiently, moved up a weight class, narrowly lost a split decision to the subsequent IBF champion Thanongsak Simsri in December 2024, then halted Takeru Inoue inside five rounds last August to signal his renewed readiness. Ranked ninth in the division by The Ring magazine, he stepped into Korakuen Hall hoping to become a two-weight world champion and, in his own words, to change his life. There are few more honest motivations in boxing than that.

He brought a significant physical advantage. An inch taller than Santiago and two inches longer in the reach, Taniguchi had also stopped fifteen of his twenty-one opponents, a knockout ratio of over seventy per cent that gave his challenge an edge of genuine danger. He fights as a southpaw, which always presents complications, and he had studied Santiago's victories over Iwata and Takami carefully enough to have mapped the Puerto Rican's adaptive tendencies before a single punch was thrown.

The early rounds belonged to Taniguchi, and the Korakuen Hall crowd responded accordingly. Moving forward with purpose behind sharp combinations, the challenger used his southpaw angles to work the outside of Santiago's guard, snapping off his left hand and making the champion adjust his range repeatedly. Santiago, rangy and technically precise, appeared content to weather the opening exchanges without panic, measuring Taniguchi and filing information away for later use. It was the kind of patience that can look like passivity to the uninformed observer and like intelligence to everyone else.

The fifth round altered the complexion of the contest in a decisive manner that a single knockdown cannot. Santiago found his range, landed cleanly, and sent Taniguchi to the canvas for the first time. The specific mechanics of the punch are less important than its consequences. From that moment onward, the fight changed character entirely. Taniguchi, who had been dictating terms and troubling the champion with his movement and combination work, was now operating from a position of recovery, with the scorecards tilted against him, and the pressure to finish was shifting the tactical equation.

Santiago's response to having the knockdown in his ledger was pragmatic in the extreme. He moved. He countered. He made himself difficult to hit cleanly and capitalised on every opportunity Taniguchi created in his increasingly urgent attempts to turn the tide. The Puerto Rican's footwork through the middle and later rounds was exceptional, given the pressures of a world championship fight in enemy territory; his head movement and ring generalship kept Taniguchi's southpaw left hand at bay with a consistency the challenger simply could not solve. It was a masterclass in consolidation, the art of protecting a lead without surrendering activity, and it spoke to a ringcraft that Santiago has clearly refined over the course of a career containing both early promise and genuine adversity.

Taniguchi never stopped trying, and there was the matter of those two closer scorecards to acknowledge. The 115-113 reading reflected a fight that, on a different night or with a different set of judges, could have produced a rather more contentious outcome. Taniguchi's early rounds were competitive, his spirit was commendable throughout, and his ambition to become a two-weight world champion was evident in every exchange. The fifth round simply proved too costly to overcome against a fighter of Santiago's calibre and experience. These are the margins upon which fights at this level are decided.

Santiago is now three fights into a unified championship reign built improbably entirely on Japanese soil. His promoter, Felix Zabala, had spoken in the build-up about defending the titles three or four times in 2026, and the next challenge in the division is already taking shape. The WBA's top-rated contender, the fast-rising Daiya Kira, has been mentioned as a potential opponent for the Puerto Rican's next assignment, which may well mean a fourth consecutive trip to Japan. On the available evidence, Santiago would not lose much sleep over the prospect.

Santiago is writing an amazing chapter in his career. Having lost his first challenge for the WBO light flyweight title to Jonathan Gonzalez, he has regrouped to not only win the same vacant title against Ricardo Astuvilca, but also go on to defend the title three times against Japanese challengers, all in Tokyo. As mentioned in our report, Daiya Kira is being mentioned as Santiago’s possible next challenger. With only four professional fights behind him, the 22-year-old would enter that fight as a big underdog anywhere in the world other than Japan. Credit goes to Taniguchi for this challenge. Taller and longer, a former world minimum-weight world champion, the highly touted southpaw is skilful and resilient, and gave everything he had in this challenge, but fell short against a special champion.