Alex Santisima Stuns Oguni with 8th-Round TKO in Japan

A Statement Win at Korakuen Hall

Fight fans packed the storied Korakuen Hall in Tokyo on Sunday, August 16, 2026, expecting a tough test for the young Filipino challenger Alex Santisima Jr. against former world champion Yukinori Oguni. Instead, they witnessed one of the biggest upsets of the year, as Santisima walked away with a signature eighth-round stoppage in the ten-round super bantamweight main event staged under Treasure Boxing Promotion.

At the weigh-in the day before the bout, the 26-year-old Santisima looked sharp and ready at 120.8 pounds, while the 37-year-old Oguni tipped the scale at 121.9 pounds. On paper, the experienced former titleholder was expected to have the edge, but the fight itself told a completely different story once the bell rang.

Fight Recap: Speed, Timing, and Relentless Pressure

If you're following the scene closely, our Ming Hung Lee Stops Demecillo, Wins WBF Title in Cebu is worth a look too.

From the opening round, Santisima set the tempo with quick combinations and constant forward movement, refusing to allow Oguni to settle into any rhythm. Round after round, the younger Filipino wore down the veteran with sharp exchanges and disciplined footwork, gradually taking control of the contest.

By the middle rounds, Santisima was clearly dictating the pace, breaking down Oguni's defense bit by bit. The turning point arrived in round eight, when a heavy flurry of punches forced the referee to step in and stop the contest, handing Santisima the biggest win of his career.

For another recent story from the same corner of the sport, check out Pero Stops Whitfield in Round 3, Nears Title Shot.

Redemption for the ZIP Sanman Camp

Beyond the result itself, the victory carried significant weight for the ZIP Sanman Boxing Team. Oguni, who holds rankings with the WBO, RING, WBC, and WBA organizations, had previously scored a unanimous decision win over Filipino former two-division world champion Marlon Tapales back in April. Santisima's stoppage win over the same opponent felt like a direct response on behalf of Filipino boxing.

Santisima competes under the ZIP Sanman Boxing Team banner, representing fighters from Cebu and General Santos, and is guided by coach Michael Domingo, a former ALA fighter who has built a strong reputation as a trainer. The win in Tokyo added another achievement to Domingo's growing list of accomplishments as a corner mentor.