Info
| Last name | van Witzenburg-de Groot |
| First name | Marieke |
| Nationality |  Netherlands |
| Date of birth | 29-10-1985 |
| Age | 40 |
Monuments
Grand tours
| Year | Giro d'Italia | Tour de France | Vuelta a España |
|---|---|---|---|
| 2020 | - | - | 54th |
| Date | Rank | Race |
|---|---|---|
| 23-06 | DNF | National Road Championships - Netherlands (CN) |
| 10-04 | DNS |  De Brabantse Pijl (1.Pro) |
| 31-03 | DNF | Ronde van Vlaanderen (1.WWT) |
| 27-03 | DNF | Dwars Door Vlaanderen (1.Pro) |
| 24-03 | DNF | Gent-Wevelgem In Flanders Fields (1.WWT) |
| 13-03 | DNF | Danilith Nokere Koerse Women (1.Pro) |
| 06-03 | DNF | GP Oetingen by St Feuillien (1.1) |
| 27-02 | DNF | Le Samyn des Dames (1.1) |
| 24-02 | 117 | Omloop Het Nieuwsblad Women (1.WWT) |
| 21-01 | DNF |  Trofeo Palma Femina (1.1) |
| 20-01 | 114 | Trofeo Calvià Femina (1.1) |
Teams
Victories
| This year | 0 |
| Total | 0 |