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 |
|---|---|---|
| 12-11 | 30 | De Grote Prijs van Brabant (C1) |
| 25-10 | 24 | 16e Kiremko Nacht van Woerden (C2) |
| 02-10 | 38 | Hansgrohe Superprestige Gieten (C1) |
| 24-06 | DNF | National Road Championships - Netherlands (CN) |
| 22-06 | 23 | National Road Championships - Netherlands TT (CN) |
| 12-06 | DNF |  Flanders Diamond Tour (1.1) |
| 08-05 | 45 | Trofee Maarten Wynants (1.2) |
| 24-04 | DNF | Dwars door de Westhoek (1.1) |
| 17-04 | 80 | Ronde van Gelderland (1.2) |
| 30-03 | DNF | Pajot Hills Classic (1.2) |
| 02-03 | DNF | Le Samyn des Dames (1.2) |
Teams
Victories
| This year | 0 |
| Total | 0 |