Australian Thomas Randle cruised to the chequered flag as his championship rivals ran into drama in an incident-filled Toyota Racing Series race at Hampton Downs on Sunday.
The 20-year-old became the first Australian to win the New Zealand Motor Cup since Warwick Brown in 1975 as he led from start to finish in the weekend's feature race.
Austrian Ferdinand Habsburg finished second and Jehan Daruvala third but championship leader Richard Verschoor and New Zealander Marcus Armstrong were caught up in incidents.
Habsburg, last year's New Zealand Grand Prix champion, made a great start from the third row of the grid to jump a couple of cars including that of series leader Verschoor.
American driver Keyvan Andres and Ameya Vaidyanathan were involved in a collision that resulted in both cars going off the track on lap two and prompted a safety car intervention.