The 1990 McLaren season was McLaren's 25th season as a constructor. After the controversy of 1989 which soured their relationship at McLaren, Alain Prost left for Ferrari and taking his place as Ayrton Senna's team-mate was Gerhard Berger. Senna won the championship in yet again another controversial decider. In the Japanese Grand Prix, he collided with Prost at the very first corner, thus clinching the title for Senna.