Marcel Duijn (born 12 May 1977) is a Dutch former cyclist, who competed as a professional from 2000 to 2002 with Rabobank.
He rode in the 2000 Giro d'Italia and the 2001 Paris–Roubaix.
[1] In 1999, he won the Gerrie Knetemann Trofee for the best under-23 Dutch cyclist.
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