 Nyorai mberi kweiyi ndima - Akaberekerwa muVugizo, kumaodzanyemba kweBurundi, Niyongabo akahwina menduru yesirivha mumakwikwi emamita 1500 pa 1992 World Junior Championshipsuye akauyawo ari wechina pamamita 800. Akakwikwidza mumutambo wake wekutanga mukuru gore rakatevera, asi akabviswa mu1500 m semi-fainari yeWorld Championships muStuttgart. Niyongabo akakurumidza kuva mumwe wevamhanyi vepamusoro-soro mumakwikwi emamita 1500 munyika, achikunda makwikwi makuru akawanda muna 1994 na1995. Akakundawo menduru yendarira paWorld Championships muGothenburg, achipedza shure kwaNoureddine Morceli naHicham El Guerrouj. 