Mezue ahịrịokwu na-esonụ: N'afọ 1983, Nzau bụ onye Kenya mbụ meriri n'ọsọ marathon nke ụwa mgbe o meriri na 1983 Chicago Marathon. Ka otu afọ gachara, Nzau gbara onye nke asaa n'asọmpi ahụ.
marathon ụmụ nwoke na 1984 Summer Olympics. Na mgbakwunye na marathon, Nzau gbara onye nke iri na anọ n'ime mmadụ iri na isii na-agba ọsọ n'ọsọ 10,000 nke ụmụ nwoke n'otu asọmpi ahụ. N'afọ 1990, Nzau meriri asọmpi Belgrade Marathon nke mbụ.