Kate Walker is your guide to a team-by-team run-down of what happened on the opening day of official Formula One testing at Jerez in Spain.
Daniel Ricciardo ran the second least amount of laps today at Jerez after an engine change early in the day.
Vettel managed just 11 laps with the RB10 over his two days, and now hands over to teammate Daniel Ricciardo.
"Our current problems are not with the team, but in the engine area. The team has more than excellent know-how." - Dietrich Mateschitz.
Belated start for new Mercedes-powered machine after car is flown to Jerez testing.
Something is going on with the Red Bull power plant.