 Gregory John Kosc akaberekwa musi waApril 27, 1949 aimbova mutongi muMajor League Baseball uyo akashanda muAmerican League kubva muna 1976 kusvika muna 1999. Akatonga muWorld Series muna 1987 na1997, uye muAll-Star Game muna 1981 na1992. Akashandawo muAmerican League Championship Series muna 1979, 1988 na1993, uye American League Division Series muna 1996 na1997. Kosc akapfeka yunifomu nhamba 18 apo vatongi veAmerican League vakaigamuchira muna 1980. 