San Marinó-i Nagydíj
1981 · 4. forduló · Imola, Olaszország · 1981. máj. 3.Futam-összefoglaló
Piquet nyerte a futamot az 5. rajthelyről, 4,580 mp-cel Patrese előtt. A nap embere Surer volt: a 21. rajthelyről a 9. helyig jött fel. A legtöbbet Villeneuve veszített, az 1. rajthelyről a 7. helyre csúszva vissza (6 hellyel hátrébb).
| Hely | Versenyző | Csapat | Rajt | Kör | Idő / státusz | Pont |
|---|---|---|---|---|---|---|
| 1 | Nelson Piquet | Brabham | 5 | 60 | 1:51:23.970 | 9 |
| 2 | Riccardo Patrese | Arrows | 9 | 60 | +4.580 | 6 |
| 3 | Carlos Reutemann | Williams | 2 | 60 | +6.340 | 4 |
| 4 | Hector Rebaque | Brabham | 13 | 60 | +22.890 | 3 |
| 5 | Didier Pironi | Ferrari | 6 | 60 | +25.870 | 2 |
| 6 | Andrea de Cesaris | McLaren | 14 | 60 | +1:06.610 | 1 |
| 7 | Gilles Villeneuve | Ferrari | 1 | 60 | +1:41.970 | 0 |
| 8 | René Arnoux | Renault | 3 | 59 | +1 Lap | 0 |
| 9 | Marc Surer | Ensign | 21 | 59 | +1 Lap | 0 |
| 10 | John Watson | McLaren | 7 | 58 | +2 Laps | 0 |
| 11 | Patrick Tambay | Theodore | 16 | 58 | +2 Laps | 0 |
| 12 | Alan Jones | Williams | 8 | 58 | +2 Laps | 0 |
| 13 | Slim Borgudd | ATS | 24 | 57 | +3 Laps | 0 |
| – | Jean-Pierre Jabouille | Ligier | 18 | 45 | Not classified | 0 |
| – | Eliseo Salazar | March | 23 | 38 | Spun off | 0 |
| – | Michele Alboreto | Tyrrell | 17 | 31 | Collision | 0 |
| – | Beppe Gabbiani | Osella | 20 | 31 | Collision | 0 |
| – | Bruno Giacomelli | Alfa Romeo | 11 | 28 | Collision | 0 |
| – | Eddie Cheever | Tyrrell | 19 | 28 | Collision | 0 |
| – | Mario Andretti | Alfa Romeo | 12 | 26 | Gearbox | 0 |
| – | Keke Rosberg | Fittipaldi | 15 | 14 | Engine | 0 |
| – | Jacques Laffite | Ligier | 10 | 7 | Suspension | 0 |
| – | Alain Prost | Renault | 4 | 3 | Gearbox | 0 |
| – | Miguel Ángel Guerra | Osella | 22 | 0 | Accident | 0 |
| – | Jan Lammers | ATS | – | 0 | Retired | 0 |
| – | Elio de Angelis | Team Lotus | – | 0 | Withdrew | 0 |
| – | Nigel Mansell | Team Lotus | – | 0 | Withdrew | 0 |