Räikkönen entered Formula One as a regular driver for Sauber-Petronas in 2001. Having previously only raced in very junior open-wheel categories, he was given his Super Licence from the Fédération Internationale de l'Automobile (FIA) after a performance delivery promise from his team boss, Peter Sauber. He joined McLaren Mercedes in 2002, and became a title contender by finishing runner-up in the 2003 and 2005 championships to Michael Schumacher and Fernando Alonso, respectively.