The 1989 season saw Alain Prost claim his third world championship and last with McLaren, with the team also taking the constructors' title for the second consecutive year. The championship was decided in highly controversial circumstances at the penultimate race meeting of the year; the 1989 Japanese Grand Prix. Senna, needing to win collided with Prost during the final laps of the race, causing Prost to retire from the race, only for Senna to be disqualified after the race for re-entering the track incorrectly. This consequently handed Prost the title.