power past Prost on the straight. Their embittered season ended as many pundits had feared. In the at the end of lap 46, Senna made his move at the Casio Chicane. Prost, turning into the corner, turned into his teammate's path resulting in a collision and the cars sliding interlocked down the escape road. Prost, thinking the World Championship was over, climbed out of his stalled car. To separate the cars, the marshals pushed Senna's McLaren backwards onto the track. This left it in a dangerous position, so they pushed it forwards again. As they did so, Senna bump-started the engine. He drove through the chicane and rejoined. The nose of Senna's car was damaged and he had to pit, but he rejoined only five seconds behind the Benetton of Alessandro Nannini. On lap 50, Ayrton sliced past Nannini at the chicane to take the lead and won the race. But it was Nannini who appeared on the top step of the podium, race officials having excluded Senna for missing the chicane. McLaren appealed the decision, but the FIA Court of Appeal not only upheld the decision but fined Senna US$100,000 and gave him a suspended six-month ban. Thus, Prost clinched his third driver's title in controversial circumstances, later stating "Ayrton Senna came behind me, I didn’t see him come and I couldn’t do anything to avoid him. I am very sorry to have to finish the championship on such an incident". Ferrari (1990–1991) Prost signed to join Ferrari in 1990, becoming the first driver signed to the team after the death of team founder Enzo Ferrari in 1988. He replaced Gerhard Berger at Ferrari and was partnered with Britain's Nigel Mansell for (Berger took Prost's seat at McLaren). As reigning world champion, Prost took over as the team's lead driver and was said to have played on this status. Mansell recalls one incident where at the 1990 British Grand Prix, the car he drove didn't handle the same as in the previous race where he had taken pole position, and later found out from team mechanics that Prost saw Mansell as having a superior car and had them swapped without Mansell knowing. Prost won five races for Ferrari that year, in Brazil, Mexico, France, Britain and Spain. Notable among these was the Mexican Grand Prix, where he won after starting in 13th position. In both the Mexican and Spanish