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
2010 Formula One World Championship technical and sporting regulations applicable for the season were the subject of much debate. Before the start of the season, 2009 Drivers' Champion Jenson Button joined McLaren, while the 2009 Constructors' Champion, Brawn GP, was bought by German motor vehicle manufacturer Mercedes-Benz and was renamed as Mercedes GP. The 2010 season saw the return of the most successful driver in Formula One history, with seven-time World Champion Michael Schumacher coming out of retirement after a three-year absence since 2007. The season's first race was held on 14 March in Bahrain and the season concluded on 14 November in the United