Rubuta ci gaba ga wannan sakin layi - A 1900, Clarke ya shiga Pittsburgh Pirates a matsayin dan wasa da kuma manajan, matsayin da zai rungumi har zuwa lokacin da ya yi ritaya a 1915. An yi jayayya cewa mafi kyawun kakar wasan Clarke ne yayin da ya jagoranci manyan wasannin a cikin matsakaicin slugging da OPS kuma ya jagoranci National League a cikin sau biyu. Ya gama na biyu ne kawai ga abokin aikinsa, Honus Wagner, don taken buga wasan National League. A gasar cin kofin duniya ta farko
, Clarke ya buga.265 amma Boston ta Cy Young da Bill Dinneen outpitched Pittsburgh overall kuma ya lashe jerin a wasanni takwas.