Rubuta ci gaba don wannan sakin layi - Watanabe ya shiga cikin manyan goma na Duniya a Gasar Cin Kofin Duniya ta 1978, inda ya zama na 8. A kakar wasa ta gaba, ta lashe lambar tagulla a gasar cin kofin duniya ta 1979
, ta zama mace ta farko 'yar Japan da ta samu lambar yabo a gasar.