Peter Sagan wins first stage of the Tour de France . Slovakian outsprinted Fabian Cancellara and Edvald Boasson Hagen . Peter Sagan of Slovakia marked his debut in the Tour de France by winning the first stage of this year 's race in Seraing Sunday . Cancellara keeps race leader 's yellow jersey . - Cyclingnews.com :
Peter Sagan wins first stage of the Tour de France . Slovakian outsprinted Fabian Cancellara and Edvald Boasson Hagen . Cancellara keeps race leader 's yellow jersey . - Cyclingnews.com :