Nyorai mberi kweiyi ndima - Groff akaedza kuita kutanga kwake muCART Champ Car muna 1990 Indianapolis 500
nokuda kweEuromotorsport asi akakundikana kukwanisa. Akaita kutanga kwake mavhiki matatu gare gare paDetroit Grand Prix nechikwata chimwe chete uye akapedza mwaka navo. Mumatanho gumi nemaviri, akawana nzvimbo yechinomwe paNazareta uye akawana nzvimbo yechigumi nenomwe.