Buuxi weedha soo socota: Unser wuxuu sameeyay kulankiisii ugu horeeyay ee IndyCar sanadkii 1962 (marka laga reebo tartamada Pikes Peak oo qayb ka ahaa xilli ciyaareedkii IndyCar 1950-yadii). Wuxuu u tartamay Andy Granatelli intii u dhaxeysay 1963 iyo 1965 isagoo wata matoor Novi ah. Unser wuxuu ku tartamay Indianapolis 500 kii ugu horeeyay sanadkii 1963. Markii hore ayuu shil galay wuxuuna galay kaalinta 33aad. Unser ayaa markiisi labaad ku guuleystay Indianapolis 500
1964 ayaa ku dhamaatay wareegii labaad shilkaas oo ay ku dhinteen Eddie Sachs iyo Dave MacDonald. Unser wuxuu u guuray IndyCar oo uu leeyahay Bob Willke laga soo bilaabo 1966 ilaa 1970. Guushiisii ugu horeysay ee IndyCar waxay timid 1967 gudaha Mosport, Ontario. Sanad ka dib, Unser wuxuu ku guuleystay Indianapolis 500 markii ugu horeysay, isagoo dhigay rikoorkii ugu horeeyay ee tartan ka badan 170 mayl saacaddii Indianapolis. Sanadkii 1968, Unser wuxuu la shaqeeyay madaxa shaqaalaha Jud Phillips wuxuuna ku guuleystay horyaalkiisii ugu horreeyay ee USAC National Driving Championship isagoo ku guuleystay Stardust International Raceway, Phoenix Raceway, Trenton Speedway, Indy, iyo Pikes Peak Hill Climb.