on lap 21. In the other Ferrari, Nigel Mansell retired from fifth on lap 49, when his clutch disintegrated and pierced the oil tank. The engine seized and caught fire, sending Mansell into a spin. Senna built his lead over Alesi to 28.5 seconds, but backed off slightly when his engine began sounding less than healthy. Stefano Modena and Satoru Nakajima, in a Brabham and the second Tyrrell, respectively, finished the scoring in fifth and sixth places. It was the 21st win of Ayrton Senna's career and the first of six for the season. Alesi's podium finish was the first of his career. The first two finishers were full of praise for one another after the race. Senna said he knew Alesi had the ingredients to be World Champion, and Alesi gushed, "He is my hero and has been for many years." Other winners in the race were Ken Tyrrell, with two cars in the points; and Pirelli, with three points finishers. Race classification Championship standings after the race Drivers' Championship standings Constructors' Championship standings References Rob Walker (June, 1990). "2nd United States Grand Prix at Phoenix: Senna's Surprise". Road & Track, 92–96. External links United States Grand Prix United States Grand Prix Grand Prix United States Grand Prix History of Phoenix, Arizona