CEBU CITY, Philippines — Filipino boxing champion Gabriel “Iron Punch” Santisima is set to return to Japanese soil for another crucial championship assignment as he defends his World Boxing Organization (WBO) Asia-Pacific super bantamweight title against local challenger Kaito Yamasaki on December 6, 2026.
The 10-round championship bout is scheduled at the Sumiyoshi Sports Center in Osaka, Japan, according to SunStar Cebu. The matchup puts Santisima’s regional title and growing international reputation on the line against a Japanese opponent determined to get back into the championship picture.
For Santisima, the upcoming fight represents another opportunity to demonstrate that his rise in the super bantamweight division is no fluke. For Yamasaki, it is a chance to regain momentum and capture a major regional championship.
Santisima’s rise continues after a career-changing upset
Santisima made headlines on February 7, 2026, when he defeated previously unbeaten Japanese boxer Subaru Murata by unanimous decision at Korakuen Hall in Tokyo to capture the WBO Asia-Pacific super bantamweight title.
The Filipino earned the judges’ scores of 96-93, 96-93 and 97-92 after a competitive 10-round contest. A counter left hook that knocked Murata down late in the sixth round proved to be a pivotal moment in the fight.
The victory was particularly significant because Murata entered the contest with a reputation as a dangerous puncher. Santisima’s performance demonstrated his ability to combine pressure, counterpunching and composure against a highly regarded Japanese opponent.
The Ring also reported on Santisima’s upset victory, highlighting how the Filipino’s aggressive approach and well-timed counters helped him overcome a favored opponent.
Sources: SunStar Cebu, The Ring and The Freeman.
A successful first defense adds to his momentum
Santisima subsequently defended his championship on July 11, 2026, against India’s Marsolo Pandian, winning by first-round knockout, according to published boxing records.
That victory strengthened his position as regional champion heading into his December assignment. His overall record was listed at 11 wins, one loss and one draw, with eight knockouts in SunStar Cebu’s October 16 report.
The upcoming defense is therefore more than another appearance abroad: Santisima will be looking to preserve the championship he worked to capture in Japan and build on the momentum generated by his recent victories.
Who is Kaito Yamasaki?
Yamasaki presents a challenge that Santisima cannot afford to underestimate.
The 28-year-old Japanese boxer has a reported professional record of 11 wins, two losses and one draw, including six knockouts. He has also recorded victories over former world champion Srisaket Sor Rungvisai and Filipino boxers Sugarey Leonard Pores and Carlo Demecillo, according to SunStar Cebu.
However, Yamasaki enters the December matchup following a fifth-round stoppage loss to Toshiya Ishii in an Oriental and Pacific Boxing Federation super bantamweight title contest on June 7, 2026.
That setback gives him an additional reason to pursue a strong performance against Santisima. A victory over the reigning WBO Asia-Pacific champion would offer Yamasaki an opportunity to re-establish himself in the regional title picture.
What is at stake for the Filipino champion?
Santisima’s championship defense carries implications beyond retaining a regional belt. Strong performances against quality international opponents can help a boxer strengthen his standing in the world rankings and move closer to more significant opportunities.
His victory over Murata already helped him break into the WBO’s super bantamweight rankings. SunStar Cebu reported that Santisima was ranked No. 7 in the division in its October 16 coverage.
Still, the December fight presents a fresh challenge. Yamasaki will be competing in front of his home crowd, while Santisima must once again demonstrate that he can perform under pressure on Japanese soil.
The Filipino champion’s task will be to use his experience, maintain his composure and avoid allowing the challenger to dictate the pace.
Can Santisima keep his championship run alive?
With the December 6 showdown approaching, Santisima faces another important test in his developing professional career.
He has already shown that he can upset a favored Japanese opponent and follow that breakthrough with a knockout victory in his first title defense. Now, he must prove that he can sustain that success against a challenger with experience against Filipino fighters and a history of competing for regional honors.
A win in Osaka would strengthen Santisima’s championship credentials and potentially help him pursue bigger opportunities in the super bantamweight division.
But Yamasaki will have home advantage and his own ambitions to consider.
Will Santisima extend his title reign in Japan, or can Yamasaki derail the Filipino champion’s growing momentum? The answer awaits on December 6.
