1991 United States Grand Prix.
1991 United States Grand Prix.
Phoenix, Arizona, U.S
A.
8-10 March 1991.
Ayrton Senna (McLaren MP4/6 Honda) leads Alain Prost (Ferrari 642), Nigel Mansell, Riccardo Patrese (both Williams FW14 Renault's) and Jean Alesi (Ferrari 642) at the start.
Ref-91 USA 20.
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