| «1991-01» | USA Grand Prix - XXVIII United States Grand Prix |
| 1991-03-10 | Phoenix - 81 laps × 3.721 km : 301.401 km |
| Pos | Grid | Car | Driver | Constructor | Q1 | Q2 | Best | Gap | Interval |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 1 | 1 | Ayrton Senna | McLaren • Honda | 01:23.530 | 01:21.434 | 01:21.434 | 164.496 km/h | |
| 2 | 2 | 27 | Alain Prost | Ferrari | 01:24.507 | 01:22.555 | 01:22.555 | +01.121 (+1.377%) | +01.121 |
| 3 | 3 | 6 | Riccardo Patrese | Williams • Renault | 01:24.726 | 01:22.833 | 01:22.833 | +01.399 (+1.718%) | +00.278 |
| 4 | 4 | 5 | Nigel Mansell | Williams • Renault | 01:25.277 | 01:23.218 | 01:23.218 | +01.784 (+2.191%) | +00.385 |
| 5 | 5 | 20 | Nelson Piquet | Benetton • Ford Cosworth | 01:25.026 | 01:23.384 | 01:23.384 | +01.950 (+2.395%) | +00.166 |
| 6 | 6 | 28 | Jean Alesi | Ferrari | 01:23.519 | 01:23.805 | 01:23.519 | +02.085 (+2.560%) | +00.135 |
| 7 | 7 | 2 | Gerhard Berger | McLaren • Honda | 01:25.914 | 01:23.742 | 01:23.742 | +02.308 (+2.834%) | +00.223 |
| 8 | 8 | 19 | Roberto Moreno | Benetton • Ford Cosworth | 01:25.170 | 01:23.881 | 01:23.881 | +02.447 (+3.005%) | +00.139 |
| 9 | 9 | 21 | Emanuele Pirro | Dallara • Judd | 01:24.876 | 01:24.792 | 01:24.792 | +03.358 (+4.124%) | +00.911 |
| 10 | 10 | 22 | JJ Lehto | Dallara • Judd | 01:26.765 | 01:24.891 | 01:24.891 | +03.457 (+4.245%) | +00.099 |
| 11 | 11 | 4 | Stefano Modena | Tyrrell • Honda | 01:25.065 | 01:25.557 | 01:25.065 | +03.631 (+4.459%) | +00.174 |
| 12 | 12 | 7 | Martin Brundle | Brabham • Yamaha | 01:27.184 | 01:25.385 | 01:25.385 | +03.951 (+4.852%) | +00.320 |
| 13 | 13 | 11 | Mika Hakkinen | Lotus • Judd | 01:27.976 | 01:25.448 | 01:25.448 | +04.014 (+4.929%) | +00.063 |
| 14 | 14 | 32 | Bertrand Gachot | Jordan • Ford Cosworth | 01:27.568 | 01:25.701 | 01:25.701 | +04.267 (+5.240%) | +00.253 |
| 15 | 15 | 23 | Pierluigi Martini | Minardi • Ferrari | 01:25.815 | 01:25.715 | 01:25.715 | +04.281 (+5.257%) | +00.014 |
| 16 | 16 | 3 | Satoru Nakajima | Tyrrell • Honda | 01:26.058 | 01:25.752 | 01:25.752 | +04.318 (+5.302%) | +00.037 |
| 17 | 17 | 34 | Nicola Larini | Lamborghini | 01:27.761 | 01:25.791 | 01:25.791 | +04.357 (+5.350%) | +00.039 |
| 18 | 18 | 16 | Ivan Capelli | Leyton House • Ilmor | 01:54.845 | 01:26.121 | 01:26.121 | +04.687 (+5.756%) | +00.330 |
| 19 | 19 | 29 | Eric Bernard | Lola • Ford Cosworth | 01:27.446 | 01:26.425 | 01:26.425 | +04.991 (+6.129%) | +00.304 |
| 20 | 20 | 25 | Thierry Boutsen | Ligier • Lamborghini | 01:27.984 | 01:26.500 | 01:26.500 | +05.066 (+6.221%) | +00.075 |
| 21 | 21 | 30 | Aguri Suzuki | Lola • Ford Cosworth | 01:26.987 | 01:26.548 | 01:26.548 | +05.114 (+6.280%) | +00.048 |
| 22 | 22 | 17 | Gabriele Tarquini | AGS • Ford Cosworth | 01:27.164 | 01:26.851 | 01:26.851 | +05.417 (+6.652%) | +00.303 |
| 23 | 23 | 15 | Mauricio Gugelmin | Leyton House • Ilmor | 01:26.865 | 01:26.875 | 01:26.865 | +05.431 (+6.669%) | +00.014 |
| 24 | 24 | 8 | Mark Blundell | Brabham • Yamaha | 01:30.061 | 01:26.915 | 01:26.915 | +05.481 (+6.731%) | +00.050 |
| 25 | 25 | 9 | Michele Alboreto | Footwork • Porsche | 01:29.067 | 01:27.015 | 01:27.015 | +05.581 (+6.853%) | +00.100 |
| 26 | 26 | 24 | Gianni Morbidelli | Minardi • Ferrari | 01:27.625 | 01:27.042 | 01:27.042 | +05.608 (+6.887%) | +00.027 |
| 27 | 10 | Alex Caffi | Footwork • Porsche | 01:29.388 | 01:27.519 | 01:27.519 | +06.085 (+7.472%) | +00.477 | |
| 28 | 18 | Stefan Johansson | AGS • Ford Cosworth | 01:29.857 | 01:27.753 | 01:27.753 | +06.319 (+7.760%) | +00.234 | |
| 29 | 26 | Erik Comas | Ligier • Lamborghini | 01:28.904 | 01:27.159 | 01:27.159 | +05.725 (+7.030%) | ||
| 30 | 12 | Julian Bailey | Lotus • Judd | 01:30.758 | 01:28.570 | 01:28.570 | +07.136 (+8.763%) | +01.411 | |
| 31 | 33 | Andrea de Cesaris | Jordan • Ford Cosworth | 01:30.937 | 01:30.937 | +09.503 (+11.670%) | +02.367 | ||
| 32 | 31 | Pedro Chaves | Coloni • Ford Cosworth | 01:31.113 | 01:31.113 | +09.679 (+11.886%) | +00.176 | ||
| 33 | 14 | Olivier Grouillard | Fondmetal • Ford Cosworth | 01:32.123 | 01:32.126 | +10.692 (+13.130%) | +01.013 | ||
| 34 | 35 | Eric van de Poele | Lamborghini | 01:37.046 | 01:37.046 | +15.612 (+19.171%) | +04.920 |