F1: Marko Says Ricciardo Silenced Doubters, Hakkinen Blasts Vettel

Daniel Ricciardo has proved his doubters wrong - even those who wear a Red Bull uniform.

That is the claim of Dr Helmut Marko, the force behind the energy drink company's driver development programme that produced world champion Sebastian Vettel.

But the programme, described by some as brutal, has also discarded its fair share of talents, including Jaime Alguersuari who was dropped at just the age of 21.