All available race results Leen de Groot
| Date | Race | Rank |
| 18/03 | Ster van Zwolle | 2 |
Rider information for 1967
| Rank | 1027 |
| Score | 1 |
| Name | Leen DE GROOT |
| Country | Netherlands |
| Team | Individual |
No results available in season 1968.
Rider information for 1968
| Rank | 701 |
| Score | 10 |
| Name | Leen DE GROOT |
| Country | Netherlands |
| Team | Individual |
| Date | Race | Rank |
| 01/03 | Omloop Het Volk | 95 |
| 29/07 | Scheldeprijs - Schoten | 26 |
Rider information for 1969
| Rank | 835 |
| Score | 6 |
| Name | Leen DE GROOT |
| Country | Netherlands |
| Team | Caballero |