 Rambai muchinyora ndima ino - Omwanza akawana nzvimbo dzinoverengeka dzekupedzisa mumakwikwi makuru muna 2002: aive nemumhanyi wechipiri kuParis Half Marathon, Humarathon uye Lille Half Marathon, uye akakwanisa wechitatu paNice Half Marathon uye Semi-Marathon Marvejols-Mende. Akaita kutanga kwake pamusoro pemarathon yakazara gore iroro uye akauya wechipiri kuna Lucy Karimi paReims Marathon, achipedza 42.195 km kure munguva ye2:35:36 maawa. Gore rakatevera, mukukwikwidza kwake kwechipiri chete muchiitiko ichi, akavandudza zvakanakisisa zvake nemaminitsi anenge masere kuti akunde Paris Marathon mumaawa 2:27:44, achikunda Rosaria Console mumhedziso yekumhanyisa. Akasarudzwa kuti amiririre Kenya mumutambo wemarathon yevakadzi pa2003 World Championships in Athletics, asi haana kukwanisa kupedza nhangemutange sezvo akadonha mushure memakiromita makumi maviri nemashanu. Omwanza akaenderera mberi kuhwina Reims Marathon muna Gumiguru gore iroro, kunyange zvazvo nguva yake yekukunda ye2:32:02 yakanga iri zvishoma zvishoma pane yake yeParis. 