Palmares
- 2003
- 1st, Netherlands Under-23 Road Race Championships
- 1st, Netherlands Under-23 Time Trial Championships
- 7th. Overall, Ster Elektrotoer
- 1st, Prologue (ITT)
- 1st, Stage 2
- 1st Overall, (U23) GP Linz – Passau – Budweis
- 1st, Stage 2b
- 3rd, Under-23 Road Race World Championship
- 2004
- 1st, Overall, Olympia's Tour & 2 stages
- 1st, Netherlands National Time Trial Championships
- 1st, GP Eddy Merckx
- 1st, Stage 1 Tour de l'Avenir
- 1st, Overall, Tour de Normadie
- 2nd, Under-23 Road Race World Championship
- 2nd, Under-23 Time Trial World Championship
- 2005
- 1st, Stage 2 Critérium International
- 1st, Netherlands National Time Trial Championships
- 3rd, Overall, Tour of Poland
- 1st, Stage 7b (ITT)
- GP Stad Zottegem
- 2006
- 1st, Overall, Tirreno–Adriatico
- 2007
- 1st, Trofeo Pollença
- 1st, Overall, Tour de Romandie
- 1st, Stage 5 (ITT)
- 1st, Points classification
- 1st, Stage 6, Tour de Suisse
- 1st, Overall, 3-Länder-Tour
- 1st, Stage 2
- 1st, Stage 4 (ITT)
20083rd, Overall, Vuelta a Castilla y León1st, Points classification
3rd, Overall, Tour of the Basque Country5th, Amstel Gold Race5th, La Flèche Wallonne6th, Liège–Bastogne–Liège20094th, Overall, Tour of Belgium
- 2011
- 1st, Duo Normand (with Johan Vansummeren)
- 2012
- 1st, Stage 2 TTT, Tour of Qatar
- 1st, Stage 5, Circuit de la Sarthe
Read more about this topic: Thomas Dekker (cyclist)