Nyorai kupfuurira kweiyi ndima - Marshall akatambira chikwata chenyika pakati pa 1982 na 1987, achikwikwidza paMitambo yeOlympic ya 1984 muLos Angeles. Marshall akamiririrawo Australia mumakwikwi maviri eWorld Championships; 1983 yakaitirwa muBrazil uye 1986
rakaitirwa muSoviet Union.