Roberto Guerrero CART/Champ Car results at Laguna Seca
| Year | Race # | Start | Finish | Car # | Sponsor | Chassis | Engine | Tire | Owner | Qualifying Speed | Laps | X Led | Laps Led | Status | Points | 
| 1984 | 15 | 9 | 7 | 9 | Master Mechanic | March | Cosworth | Goodyear | Bignotti | 122.583 | 97 | 0 | 0 | flagged | 6 | 
| 1985 | 13 | 3 | 4 | 9 | True Value | March | Cosworth | Goodyear | Bignotti | 125.551 | 98 | 0 | 0 | flagged | 12 | 
| 1986 | 15 | 6 | 5 | 2 | True Value-Emerson | March | Cosworth | Goodyear | Cotter | 127.027 | 98 | 0 | 0 | flagged | 10 | 
| 1988 | 14 | 13 | 14 | 4 | STP Granatelli | March | Cosworth | Goodyear | Vince Granatelli | 102.534 | 67 | 0 | 0 | off course | 0 | 
| 1989 | 15 | 21 | 25 | 21 | Alfa Romeo | March | Alfa Romeo | Goodyear | Morales | 104.158 | 23 | 0 | 0 | off course | 0 | 
| 1990 | 16 | 16 | 18 | 20 | Miller Genuine Draft | Lola | Alfa Romeo | Goodyear | Patrick |  | 75 | 0 | 0 | fire | 0 | 
| 1991 | 17 | 22 | 18 | 26 | Quaker State | Lola | Buick | Goodyear | Bernstein | 104.442 | 78 | 0 | 0 | flagged | 0 |