Ricciardo made his track debut at the wheel of a Formula One car in December 2009. He tested for Red Bull Racing at the young drivers test at Circuito de Jerez. On the final day of testing, Ricciardo had the fastest time of the test by more than one second. Ricciardo became one of the test and reserve drivers for both Red Bull Racing, and the sister team Scuderia Toro Rosso