Kammala jumla mai zuwa: Marshall ya taka leda a tawagar kasa tsakanin 1982 da 1987, yana fafatawa a wasannin Olympics na 1984 a Los Angeles. Marshall kuma ya wakilci Ostiraliya a Gasar Cin Kofin Duniya guda biyu; 1983 da aka gudanar a Brazil da
1986 da aka gudanar a Tarayyar Soviet.