 Complete the following phrase:  This race was also the last for Nigel Mansell. After the season, he ran the final three races in Formula One that season for Williams as the only active World Champion, as Alain Prost retired after the 1993 season and Ayrton Senna was killed while leading at Imola in May. After having raced at Magny-Cours in June, Mansell spun off in Jerez, finished fourth in 