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| Date | Sunday 10 March 1991 |
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| Start time | 14:00 |
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| Event |  United States GP |
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| Circuit | Phoenix |
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| Event Format | Race of 82 laps |
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| Championship | World Championship |
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| Race number | #1 of 16 in 1991
#501 (of all time) |
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| Laps | 81 |
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| Circuit Perimeter | 3721 m |
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| Race Distance | 3721 × 82 = 305.122 km (scheduled)
3721 × 81 = 301.401 km (raced) |
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| Grid Format | 2-2-2-2 (staggered) |
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| Pole Position | Right |
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| First Corner | Right |
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| Track Direction | Anti-clockwise |
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| Weather | Cloudy, Mild, Dry |
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| Entries | 34 |
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| Qualifiers | 26 |
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| Finishers | 12 |
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| Debutants | Eric van de Poele (Driver),
Mark Blundell (Driver),
Mika Häkkinen (Driver),
Pedro Matos Chaves (Driver),
Érik Comas (Driver),
Fondmetal (Car Manufacturer),
Footwork (Car Manufacturer),
Jordan (Car Manufacturer),
Lambo (Car Manufacturer),
Ilmor (Engine Manufacturer),
AGS JH25B (Car Model),
Benetton B190B (Car Model),
Brabham BT59Y (Car Model),
Coloni C4 (Car Model),
Dallara BMS-191 (Car Model),
Ferrari F1-91 (Car Model),
Fondmetal FA1ME (Car Model),
Footwork A11C (Car Model),
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Jordan 191 (Car Model),
Lambo 291 (Car Model),
Leyton House CG911 (Car Model),
Ligier JS35 (Car Model),
Lola LC91 (Car Model),
Lotus 102B (Car Model),
McLaren MP4/6 (Car Model),
Minardi M191 (Car Model),
Tyrrell 020 (Car Model),
Williams FW14 (Car Model),
Braun Tyrrell Honda (Entrant),
Camel Benetton Ford (Entrant),
Coloni Racing Srl (Entrant),
Fondmetal F1 SpA (Entrant),
Footwork Grand Prix International (Entrant),
Larrousse F1 (Entrant),
Modena Team SpA (Entrant),
Team 7Up Jordan (Entrant)
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| Milestones | Lamborghini – 100th Race Entry (Engine Manufacturer)
 Gerhard Berger – 100th Race Entry (Driver)
 Jean Alesi – 1st Fastest Lap (Driver)
 Stefano Modena – 50th Race Entry (Driver)
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| Records Broken |
None
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| Records Extended |
1. Most Drivers' Championship Points Scores – Ferrari (552),
2. Most Constructors' Championship Points Scores – Ferrari (420),
3. Most Retirements –  Lotus (529),
4. Most Podium Finishes – Ferrari (356),
5. Most Drivers' Championship Points Scores – Alain Prost (109),
6. Most Constructors' Championship Points Scores – Alain Prost (109),
7. Most Podium Finishes – Alain Prost (90),
8. Most Retirements – Riccardo Patrese (116),
9. Most 2nd Place Finishes – Ferrari (140),
10. Most 2nd Place Finishes – Alain Prost (30),
11. Most Fastest Laps – Ferrari (120),
12. Most Race Entries – Lotus (1206),
13. Most Race Entries – Riccardo Patrese (210),
14. Most Poles –  Ayrton Senna (53),
15. Most 2nd Place Qualifications – Ferrari (114),
16. Most 2nd Place Qualifications – Alain Prost (48),
17. Most 6th Place Qualifications – Ferrari (92),
18. Most 13th Place Qualifications – Lotus (58)
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