2009 Formula One World Championship joined Brawn as a test driver. Force India joined Brawn GP in using the Mercedes engines by signing a five-year deal until 2013, having ended their previous supply contract from Ferrari. The retirement of Red Bull Racing driver David Coulthard led to the appointment of Sebastian Vettel as his replacement, who left the Scuderia Toro Rosso team after a successful previous season including winning the Italian Grand Prix. Toro Rosso, a team designed to develop new Formula One drivers, saw co-owner Gerhard Berger sell his half-stake back to Red Bull, claiming that the new regulations would "leave no room for
Sebastian Vettel ever to win the World Drivers' Championship. In the same year he helped Red Bull win the team's first World Constructors' Championship. He followed up his first championship with three more titles, all in succession, becoming the youngest double, triple and quadruple world champion in Formula One. The and titles were decided in the final round, in 2010 coming out on top over Ferrari's Fernando Alonso in a four-way title battle at Abu Dhabi, whilst in 2012 defeating the same driver again by three points. The and titles saw Vettel dominating the seasons to secure the titles early. Ending his