10 Biggest Formula One Controversies
3. Prost Vs. Senna At The 1989 Japanese Grand Prix
In the 1988 season, the McLarens won a combined 15 of the total 16 races. Senna took the title due to the unique points system counting his best 11 results despite the fact Alain Prost had outscored him overall. In 1989, it was more of the same but with Prost leading the championship with his 76 points to Senna's 60 points. Senna needed to win both the last two races to defend his title.
Senna started from pole, but was passed by Prost. On lap 47, Senna caught up to the back of Prost before coming together at the final chicane. Prost was out on the spot but Senna was able to continue and win before being disqualified after having skipped the chicane and receiving outside interference.
McLaren and Senna appealed the disqualification but this appeal was dismissed with the FIA imposing an additional $100,000 fine and a suspended six month ban. Senna accused then FISA President Jean-Marie Balestre of national favoritism. As such, Alain Prost won the 1989 title and subsequently left the team for Ferrari as the reigning World Champion.
The very next year, it was the reverse situation with Prost needing to win both races to win the title. Senna had resolved to not let Prost lead out of the first corner under any circumstances. This led to a first corner collision between the pair in which Senna eventually emerged as the 1990 World Champion.