Rubuta ci gaba don wannan sakin layi - A ranar 12 ga Fabrairu, 1974, Watanabe ya fara bugawa tawagar kasar Japan wasa da Singapore. A watan Satumba, an zaba shi Japan don wasannin Asiya na 1974
Ka yi haƙuri. Ya kuma taka leda a wasannin neman shiga gasar Olympics ta 1976. Ya buga wasanni 28 kuma ya ci kwallaye 4 ga Japan har zuwa 1979.