Pedzisa mutsara unotevera: Diniz akaramba ari paArrows muna 1998, achibatsirana naMika Salo. Diniz akatsungirira kutanga kunopisa: mota yake yakatambura nematambudziko ebhokisi rekutenderera mumakwikwi matatu ekutanga uye yakatsungirira kukundikana kweinjini mumakwikwi eSan Marino neSpain. Akawana poindi yake yokutanga mumwaka uyu nokupedza ari pachinhanho chechitanhatu muMonaco uye akakwanisa kupedza mijaho mu
Canada neFrance. Diniz akatambura mamwe matatu akateedzana ekudzokera kumashure, uye akapedza makwikwi muHungary neBelgium, mune yegumi neimwe uye yechishanu zvichiteerana. Diniz akapedza mwaka nekurega mumakwikwi matatu ekupedzisira. Akapedza ari 14 muDrivers' Championship, uye akaenzana pamapoinzi newaaitamba naye Salo.