| 1 | 1988 | United States Grand Prix | 17 | Team Lucky Strike Roberts | Yamaha YZR | Yamaha | 1 | 4 |
| 2 | 1989 | United States Grand Prix | 3 | Team Lucky Strike Roberts | Yamaha YZR | Yamaha | 1 | 1 |
| 3 | 1989 | Spanish Grand Prix | 3 | Team Lucky Strike Roberts | Yamaha YZR | Yamaha | 1 | 2 |
| 4 | 1989 | Swedish Grand Prix | 3 | Team Lucky Strike Roberts | Yamaha YZR | Yamaha | 1 | DNF |
| 5 | 1989 | Brazilian Grand Prix | 3 | Team Lucky Strike Roberts | Yamaha YZR | Yamaha | 1 | 3 |
| 6 | 1990 | Japanese Grand Prix | 2 | Marlboro Team Roberts | Yamaha YZR | Yamaha | 1 | 1 |
| 7 | 1990 | Nations Grand Prix | 2 | Marlboro Team Roberts | Yamaha YZR | Yamaha | 1 | 1 |
| 8 | 1990 | Yugoslavian Grand Prix | 2 | Marlboro Team Roberts | Yamaha YZR | Yamaha | 1 | 1 |
| 9 | 1991 | Australian Grand Prix | 1 | Yamaha | Yamaha YZR | Yamaha | 1 | 1 |
| 10 | 1991 | United States Grand Prix | 1 | Marlboro Team Roberts | Yamaha YZR | Yamaha V4 | 1 | 1 |
| 11 | 1991 | Spanish Grand Prix | 1 | Marlboro Team Roberts | Yamaha YZR | Yamaha V4 | 1 | 3 |
| 12 | 1991 | Italian Grand Prix | 1 | Marlboro Team Roberts | Yamaha YZR | Yamaha V4 | 1 | 9 |
| 13 | 1991 | French Grand Prix | 1 | Yamaha | Yamaha YZR | Yamaha | 1 | 1 |
| 14 | 1991 | Czechoslovakian Grand Prix | 1 | Marlboro Team Roberts | Yamaha YZR | Yamaha V4 | 1 | 1 |
| 15 | 1993 | Czech Republic Grand Prix | 1 | Marlboro Team Roberts | Yamaha YZR | Yamaha V4 | 1 | 1 |
