Cancellara wins first stage of the Tour de France . German Greipel sprints clear of a reduced peloton in Britain . Rouen 's Mark Cavendish brought down in crash near the finish . Fabian German Greipel holds on to yellow jersey of race leader .
Andre Greipel wins fourth stage of the Tour de France . German Greipel sprints clear of a reduced peloton in Rouen . Britain 's Mark Cavendish brought down in crash near the finish . Fabian Cancellara holds on to yellow jersey of race leader .