In 20 kilometres walk at the Pan American Games Santiago Fonseca finished sixth (1975), fourth (1979), eighth (1983), and again sixth (1987).
Personal Best: 20kmW – 1-25:25 (1988).
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1976 Summer Olympics | Athletics | Santiago Fonseca | ||||
| 20 kilometres Race Walk, Men (Olympic) | 27 | |||||
| 1984 Summer Olympics | Athletics | Santiago Fonseca | ||||
| 20 kilometres Race Walk, Men (Olympic) | 31 | |||||
| 1988 Summer Olympics | Athletics | Santiago Fonseca | ||||
| 20 kilometres Race Walk, Men (Olympic) | 40 |
| Games | Role | NOC | As | |
|---|---|---|---|---|
| 1988 Summer Olympics | Flagbearer at the Opening Ceremony | Santiago Fonseca |