Scott Speed made his F1 debut with Scuderia Toro Rosso in 2006, becoming the first American in the sport since Michael Andretti in 1993.
Although team mate Vitantonio Liuzzi tended to have the upper hand in qualifying, Speed was often quicker in the races.
Speed nearly scored a point in the Australian Grand Prix but was disqualified from eighth after it emerged he’d passed David Coulthard under yellow flags.
Both remained with the team for 2007. But, despite suffering several car failures and finishing a strong ninth in Monte-Carlo, Speed was acrimoniously dropped after an argument with team boss Franz Tost at the European Grand Prix. He then moved the NASCAR, still with Red Bull backing.