 Nyora kupfuurira kweiyi ndima - Pazviitiko zviviri, Diffey akafukidza nhevedzano dzose dziri mbiri pazuva rimwe chetero. Musi wa 23 Nyamavhuvhu 2015, akashevedza Belgian Grand Prix kubva kuNBCs base muStamford, Connecticut, iye naMatchett vasati vaenda kuPocono Raceway kuABC Supply 500. Saizvozvowo, musi wa3 September 2017, Diffey akadana Grand Prix yeItalymuConnecticut ndokuzoenda kuWatkins Glen International nokuda kweIndyCar Grand Prix paThe Glen. Diffeys yakavhurika-vhiri kutarisisa yakachinjirwa chete kuIndyCar muna 2018 apo kodzero dzeUS Formula One terevhizheni dzakatamisirwa kuESPN. 