Rubuta ci gaba ga wannan sakin layi - Groff yayi ƙoƙari ya fara CART Champ Car a cikin 1990 Indianapolis 500
don Euromotorsport amma ya kasa cancanta. Ya fara wasan farko makonni uku bayan haka a Detroit Grand Prix tare da wannan ƙungiyar kuma ya kammala kakar wasa tare da su. A cikin farawa 12 ya sami kyakkyawan sakamako na bakwai a Nazarat kuma ya gama na 17 a maki.