The 2015 Formula One Season was the 66th season of the FIA Formula One World Drivers' Championship, and the 58th season of the Constructors' Championship. Lewis Hamilton successfully defended his World Drivers' Championship, taking his third title at the 2015 United States Grand Prix and defeating his team mate Nico Rosberg by 59 points by the end of the season. Mercedes defended the constructors championship, securing the title at the Russia ahead of Ferrari and Williams.