Rubuta ci gaba ga wannan sakin layi - Fuentes ya koma Giants a 1969 kuma ya shafe shekaru biyu masu zuwa a matsayin mai amfani da kayan aiki kafin ya sake samun wuri na farko a karo na biyu a 1971. Ya bayyana a cikin postseason a lokacin 1971 kakar kamar yadda ya Giants lashe NL West lakabi; ya biyu gudu gida gudu a Game 1 na 1971 NLCS
Ya taimaka San Francisco ya jagoranci jerin farko a kan Pittsburgh Pirates, amma hakan zai zama nasarar Giants kawai na mafi kyawun jerin biyar. Fuentes ya ci gaba da kasancewa dan wasan na biyu na Giants har tsawon shekaru uku. A shekara ta 1973, ya kafa rikodin National League ta hanyar yin rikodin kashi.993, mafi girma ga kowane dan wasa na biyu na yau da kullum a tarihin gasar. Abin mamaki, Fuentes ya jagoranci dukkan 'yan wasan na biyu na National League a cikin kurakurai a cikin shekaru biyu da suka gabata kafin kafa sabon rikodin don ƙwarewa. Rikodin sa ya tsaya har tsawon yanayi 13 kafin Ryne Sandberg ya yi rikodin kashi.994 a karo na biyu a 1986.