1991 Grand Prix of the USA
10 March - Phoenix: 305.122km (3.721km x 82 laps)


Race aborted after 2 hours on lap 81 (301.385 km).


Pole Position: Ayrton Senna, McLaren-Honda MP4/6, 1:21.434


Results
 1. Ayrton Senna           McLaren-Honda MP4/6           2:00:47.828 (149.698 km/h)
 2. Alain Prost            Ferrari 642                  -     16.322
 3. Nelson Piquet          Benetton-Ford B190B          -     17.376
 4. Stefano Modena         Tyrrell-Honda 020            -     25.409
 5. Satoru Nakajima        Tyrrell-Honda 020            -  1 lap
 6. Aguri Suzuki           Lola-Ford L91                -  2 laps
 7. Nicola Larini          Lamborghini 291              -  3 laps
 8. Gabriele Tarquini      AGS-Ford JH25                -  4 laps
 9. Pierluigi Martini      Minardi-Ferrari M191         -  6 laps (Engine)
10. Bertrand Gachot        Jordan-Ford 191              -  6 laps (Engine)
11. Martin Brundle         Brabham-Yamaha BT59Y         -  8 laps
12. Jean Alesi             Ferrari 642                  -  9 laps (Gearbox)
    
Fastest lap: Jean Alesi, 1:26.758 (154.394 km/h on lap 49)
    

Retirements
    Mika Häkkinen          Lotus-Judd 102B              - 22 laps (Oil union/Fire)
    Roberto Moreno         Benetton-Ford B190B          - 32 laps (Accident)
    Riccardo Patrese       Williams-Renault FW14        - 32 laps (Gearbox/Accident)
    Michele Alboreto       Footwork-Porsche A11C        - 40 laps (Gearbox)
    Thierry Boutsen        Ligier-Lamborghini JS35      - 41 laps (Electrics)
    Ivan Capelli           Leyton House-Ilmor CG911     - 41 laps (Gearbox)
    Gerhard Berger         McLaren-Honda MP4/6          - 45 laps (Fuel pump)
    Nigel Mansell          Williams-Renault FW14        - 46 laps (Gearbox)
    Mauricio Gugelmin      Leyton House-Ilmor CG911     - 47 laps (Gearbox)
    Mark Blundell          Brabham-Yamaha BT59Y         - 49 laps (Spun)
    Emanuele Pirro         Dallara-Judd 191             - 65 laps (Gearbox)
    Gianni Morbidelli      Minardi-Ferrari M191         - 66 laps (Gearbox)
    J.J. Lehto             Dallara-Judd 191             - 69 laps (Clutch)
    Eric Bernard           Lola-Ford L91                - 77 laps (Engine)
    
Did Not Qualify    
    Alex Caffi             Footwork-Porsche A11C
    Stefan Johansson       AGS-Ford JH25
    Erik Comas             Ligier-Lamborghini JS35
    Julian Bailey          Lotus-Judd 102B
    
Did Not Pre-qualify    
    Andrea de Cesaris      Jordan-Ford 191
    Pedro Chaves           Coloni-Ford C4
    Olivier Grouillard     Fomet-Ford FA1M-E
    Eric van de Poele      Lamborghini 291


    Race leaders:
    Ayrton Senna           1-81 (81 laps = 301.385 km)
-----------------------------------------------------------------------------

                                Starting Grid

 1. Ayrton Senna           McLaren-Honda MP4/6           1:21.434 (164.488 km/h)
 2. Alain Prost            Ferrari 642                  -   1.121
 3. Riccardo Patrese       Williams-Renault FW14        -   1.399
 4. Nigel Mansell          Williams-Renault FW14        -   1.784
 5. Nelson Piquet          Benetton-Ford B190B          -   1.950
 6. Jean Alesi             Ferrari 642                  -   2.085
 7. Gerhard Berger         McLaren-Honda MP4/6          -   2.308
 8. Roberto Moreno         Benetton-Ford B190B          -   2.447
 9. Emanuele Pirro         Dallara-Judd 191             -   3.358
10. J.J. Lehto             Dallara-Judd 191             -   3.457
11. Stefano Modena         Tyrrell-Honda 020            -   3.631
12. Martin Brundle         Brabham-Yamaha BT59Y         -   3.951
13. Mika Häkkinen          Lotus-Judd 102B              -   4.014
14. Bertrand Gachot        Jordan-Ford 191              -   4.267
15. Pierluigi Martini      Minardi-Ferrari M191         -   4.281
16. Satoru Nakajima        Tyrrell-Honda 020            -   4.318
17. Nicola Larini          Lamborghini 291              -   4.357
18. Ivan Capelli           Leyton House-Ilmor CG911     -   4.687
19. Eric Bernard           Lola-Ford L91                -   4.991
20. Thierry Boutsen        Ligier-Lamborghini JS35      -   5.066
21. Aguri Suzuki           Lola-Ford L91                -   5.114
22. Gabriele Tarquini      AGS-Ford JH25                -   5.417
23. Mauricio Gugelmin      Leyton House-Ilmor CG911     -   5.431
24. Mark Blundell          Brabham-Yamaha BT59Y         -   5.481
25. Michele Alboreto       Footwork-Porsche A11C        -   5.581
26. Gianni Morbidelli      Minardi-Ferrari M191         -   5.608

Did Not Qualify
27. Alex Caffi             Footwork-Porsche A11C        -   6.085
28. Stefan Johansson       AGS-Ford JH25                -   6.319
29. Erik Comas             Ligier-Lamborghini JS35      -   6.470
30. Julian Bailey          Lotus-Judd 102B              -   7.136

Did Not Pre-qualify
31. Andrea de Cesaris      Jordan-Ford 191              -   9.503
32. Pedro Chaves           Coloni-Ford C4               -   9.679
33. Olivier Grouillard     Fomet-Ford FA1M-E            -  10.692
34. Eric van de Poele      Lamborghini 291              -  15.612