| «1991-01» | USA Grand Prix - XXVIII United States Grand Prix |
| 1991-03-10 | Phoenix - 81 laps × 3.721 km : 301.401 km |
| Pos | Car | Driver | Constructor | Time | Speed | Lap | Gap |
|---|---|---|---|---|---|---|---|
| 1 | 28 | Jean Alesi | Ferrari | 01:26.758 | 154.402 km/h | 49 | |
| 2 | 27 | Alain Prost | Ferrari | 01:26.845 | 154.247 km/h | 68 | +00.087 |
| 3 | 20 | Nelson Piquet | Benetton • Ford Cosworth | 01:26.965 | 154.034 km/h | 67 | +00.207 |
| 4 | 1 | Ayrton Senna | McLaren • Honda | 01:27.153 | 153.702 km/h | 39 | +00.395 |
| 5 | 6 | Riccardo Patrese | Williams • Renault | 01:27.450 | 153.180 km/h | 24 | +00.692 |
| 6 | 4 | Stefano Modena | Tyrrell • Honda | 01:27.983 | 152.252 km/h | 69 | +01.225 |
| 7 | 19 | Roberto Moreno | Benetton • Ford Cosworth | 01:28.044 | 152.147 km/h | 40 | +01.286 |
| 8 | 3 | Satoru Nakajima | Tyrrell • Honda | 01:28.227 | 151.831 km/h | 67 | +01.469 |
| 9 | 2 | Gerhard Berger | McLaren • Honda | 01:28.286 | 151.730 km/h | 33 | +01.528 |
| 10 | 5 | Nigel Mansell | Williams • Renault | 01:28.502 | 151.359 km/h | 28 | +01.744 |
| 11 | 32 | Bertrand Gachot | Jordan • Ford Cosworth | 01:28.975 | 150.555 km/h | 73 | +02.217 |
| 12 | 30 | Aguri Suzuki | Lola • Ford Cosworth | 01:28.993 | 150.524 km/h | 12 | +02.235 |
| 13 | 11 | Mika Hakkinen | Lotus • Judd | 01:29.072 | 150.391 km/h | 43 | +02.314 |
| 14 | 16 | Ivan Capelli | Leyton House • Ilmor | 01:29.201 | 150.173 km/h | 30 | +02.443 |
| 15 | 25 | Thierry Boutsen | Ligier • Lamborghini | 01:29.310 | 149.990 km/h | 40 | +02.552 |
| 16 | 23 | Pierluigi Martini | Minardi • Ferrari | 01:29.356 | 149.913 km/h | 47 | +02.598 |
| 17 | 15 | Mauricio Gugelmin | Leyton House • Ilmor | 01:29.505 | 149.663 km/h | 24 | +02.747 |
| 18 | 34 | Nicola Larini | Lamborghini | 01:29.877 | 149.044 km/h | 46 | +03.119 |
| 19 | 21 | Emanuele Pirro | Dallara • Judd | 01:29.910 | 148.989 km/h | 14 | +03.152 |
| 20 | 9 | Michele Alboreto | Footwork • Porsche | 01:30.077 | 148.713 km/h | 27 | +03.319 |
| 21 | 17 | Gabriele Tarquini | AGS • Ford Cosworth | 01:30.242 | 148.441 km/h | 73 | +03.484 |
| 22 | 7 | Martin Brundle | Brabham • Yamaha | 01:30.472 | 148.063 km/h | 29 | +03.714 |
| 23 | 8 | Mark Blundell | Brabham • Yamaha | 01:31.092 | 147.056 km/h | 32 | +04.334 |
| 24 | 22 | JJ Lehto | Dallara • Judd | 01:31.435 | 146.504 km/h | 6 | +04.677 |
| 25 | 24 | Gianni Morbidelli | Minardi • Ferrari | 01:31.631 | 146.191 km/h | 13 | +04.873 |
| 26 | 29 | Eric Bernard | Lola • Ford Cosworth | 01:31.732 | 146.030 km/h | 4 | +04.974 |