The 1990 Japanese Grand Prix was a Formula One motor race held on 21 October 1990 at Suzuka. It was the fifteenth and penultimate race of the 1990 Formula One season. It was the 16th Japanese Grand Prix and the 6th held at Suzuka. The race saw a first-corner collision between World Championship rivals Brazilian driver Ayrton Senna and French driver Alain Prost, the second consecutive year that the World Championship had been decided by a collision between the two at the same track. The collision immediately put both cars out of the race and secured Senna his second World Championship, a reversal of fortunes from the 1989 Japanese Grand Prix, where the collision had secured the championship for Prost. The race saw a best result to that point for the Benetton Formula team, with their drivers Brazilian veteran Nelson Piquet and his protégé Roberto Moreno finishing first and second in their Benetton B190s. It was back to back wins for Benetton in Japan after the team's win the previous year. Japanese driver Aguri Suzuki scored a career-best result for himself, the Larrousse team and the Lamborghini engine, finishing third in his Lola LC90. With Ferrari scoring no points after Nigel Mansell's retirement, the McLaren team secured their sixth and third consecutive Constructors' Championship. Pre-race Before the race, Brabham announced that they would use Yamaha engines for 1991, while Footwork announced a Porsche engine deal for 1991 and retained both their 1990 drivers, Alex Caffi and Michele Alboreto. Prior to the race, the Life Racing Engines and EuroBrun teams withdrew from the sport. EuroBrun's Roberto Moreno joined the Benetton team replacing the previous year's race winner Alessandro Nannini, who was unable to attend the race following a helicopter crash that also ended his Formula One career, one week after the Spanish Grand Prix. Jean Alesi did not start after suffering a neck injury during Friday's practice. As his grid position was left empty, this was the third consecutive race to have only 25 starters instead of the usual 26. Nigel Mansell also announced a U-turn on his decision to retire by making public his agreement to join Williams-Renault for two years from 1991 after being given assurances from Frank Williams, Patrick Head and Renault that they could deliver him a car in which he could win a World Championship and that he would be the team's undisputed #1 driver. On