Former world champion Ginjiro Shigeoka has undergone brain surgery following his defeat to Pedro Taduran on Saturday night.
The Japanese boxer collapsed in the ring after the result was announced and remains in hospital under a medically induced coma.
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Shigeoka also lost consciousness after their inaugural encounter, where he was battered from pillar to post by Taduran en route to the eventual 9th-round stoppage loss last July.
The defeat saw him drop the IBF strawweight world title, a belt he had held since October 2023 when he snatched it from Daniel Valladares via fifth-round TKO.
Shigeoka underwent surgery for an orbital fracture in the immediate aftermath of their first meeting and was cleared to box the Filipino fighter again last weekend.
Their sequel was far more competitive, with Taduran edging a split decision win.
However, Shigeoka fell into an unresponsive state moments after the final bell and was rushed to hospital thereafter.
An update from Shigeoka’s handlers on Monday revealed that the 25-year-old underwent surgery and has been forced to retire as a result of his injuries.
The post read: “According to JBC [Japanese Boxing Commission], Japanese Former IBF Champion Ginjiro Shigeoka has suffered from an acute subdural hematoma and has already undergone a craniotomy.
“G. Shigeoka is still currently under observation in a private hospital in Osaka, Japan.
“The commission has already enforced that Shigeoka has to retire from boxing following his craniotomy procedure.”
A craniotomy is a surgical procedure that involves temporarily removing a portion of the skull to expose the brain.
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The operation is usually carried out to treat brain tumours, blood clots, or to repair skull fractures.
Shigeoka steps away from the sport with a 11-2-1 NC professional record.
As an amateur, he won five national titles and only lost once in 57 fights.
The sole blemish came against his brother, Yudai Shigeoka, who has since gone on to pick up the WBC belt at strawweight.
Taduran was the only man to beat Ginjiro as a pro.
