Former WBC minimumweight champion Yudai Shigeoka announced his retirement Wednesday to offer his support to his younger brother Ginjiro Shigeoka, who remains unconscious following his bout on May 24 but is no longer in a life-threatening condition.Ginjiro, a 25-year-old former IBF minimumweight champion, underwent a craniotomy to nurse a right subdural hematoma after his split decision loss to Filipino champ Pedro Taduran in a title match in Osaka.A post shared by 重岡 優大 (@yudaishigeoka)"Together with Gin, we'll flourish in a new field," the 28-year-old Yudai wrote on his Instagram. "I'v…READ FULL ARTICLE