All available race results S.G. Mackay
| Date | Race | Rank |
| 04/10 | Michigan Road handicap | 22 |
Rider information for 1890
| Rank | 844 |
| Score | 0 |
| Name | S.G. MACKAY |
| Country | United States |
| Team | Individual |
| Date | Race | Rank |
| 04/10 | Michigan Road handicap | 22 |
| Rank | 844 |
| Score | 0 |
| Name | S.G. MACKAY |
| Country | United States |
| Team | Individual |