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VITTEL, FRANCE - JULY 04: Peter Sagan of Slovakia riding for Bora-Hansgrohe and Mark Cavendish of Great Britain riding for Team Dimension Data are involved in a crash near the finish line during stage four of the 2017 Le Tour de France, a 207.5km stage from Mondorf-les-Bains to Vittel on July 4, 2017 in Vittel, France. (Photo by Chris Graythen/Getty Images)

VITTEL, FRANCE - JULY 04:  Peter Sagan of Slovakia riding for Bora-Hansgrohe and Mark Cavendish of Great Britain riding for Team Dimension Data are involved in a crash near the finish line during stage four of the 2017 Le Tour de France, a 207.5km stage from Mondorf-les-Bains to Vittel on July 4, 2017 in Vittel, France.  (Photo by Chris Graythen/Getty Images)