1991 United States Grand Prix
The 1991 United States Grand Prix (formally the XXVIII Iceberg United States Grand Prix) was a Formula One motor race held on March 10, 1991 in Phoenix, Arizona. It was the first race of the 1991 Formula One World Championship. The 81-lap race was won from pole position by Ayrton Senna, driving a McLaren-Honda, with Alain Prost second in a Ferrari and Nelson Piquet third in a Benetton-Ford.