Former WBO minimumweight champion Ryuya Yamanaka announced his retirement from boxing on medical grounds Friday after being diagnosed with bleeding around the brain.The 23-year-old received the diagnosis after being taken to the hospital following his unsuccessful title defense against Filipino Vic Saludar in Kobe in July.Under Japan Boxing Commission regulations, if a commission physician determines a boxer has suffered any degree of cerebral hemorrhaging during training sessions or fights, his license automatically becomes invalidated."I couldn't accept it at first. I thought I could keep…READ FULL ARTICLE