race of 2004 UCI Road World Championships and finished first in the UCI U23 Classification of 2004. Rabobank Dekker turned professional in 2005 with . In his first season as a professional he won Grote Prijs Stad Zottegem and stages of Critérium International and Tour de Pologne. He also repeated his victory in the Dutch National Time Trial Championships and rode the Giro d'Italia. In 2006 Dekker won the Tirreno–Adriatico stage race, making him the third Dutch cyclist to win the event, after Joop Zoetemelk (1985) and Erik Dekker (2002) and in 2007 the Tour de Romandie stage race, which featured two time trials and several difficult climbing stages in the Alps and Jura. In 2007, Dekker debuted in the Tour de France. Although he had been dreaming of winning the young rider classification, he did not win it. He eventually reached the 35th place in the overall final standings, and sixth in the young rider classification, in the Tour. Dekker finished his 2007 season with his first top ten finish in a 'Classic,' the 2007 Giro di Lombardia. The 2008 season got off to a promising start, with Dekker coming in 3rd place overall in both the Vuelta a Castilla y León and Tour of the Basque Country and achieving three top-ten finishes in the Ardennes classics. However, after a poor showing in the Tour de Suisse Dekker was not selected by Rabobank for its 2008 Tour de France line-up. On 14 August 2008 Dekker officially announced on his web page that he had split from Rabobank. Although an early report in SportWereld said Dekker was on the verge of signing with Garmin-Chipotle, team manager Jonathan Vaughters later denied this rumor. Dekker later revealed in an interview and in his book Schoon Genoeg that Vaughters had been on the verge of signing him, but the deal fell through when Dekker's blood values indicated he'd been doping. According to Dekker, this was the wake-up call he needed to quit using performance-enhancing drugs. On 27 September 2008 it was announced that Dekker had signed a contract with for two years. Silence-Lotto In 2009, Dekker finished a respectable 16th in the Tour of Switzerland, with a highlight of 3rd place in the second, 39 km long, individual time trial. On 1 July 2009, it was announced that a re-test of an out-of-competition sample taken in December 2007, while Dekker was with Rabobank,