Peter Sagan withdrew midway through the stage thus alllowing Omega Pharma - Quick - Step 's Gert Steegmans to take the lead in the general classification .
Peter Sagan led the four - stage race overnight .
Peter Sagan , who led the four - stage race overnight , withdrew midway through the stage thus alllowing Omega Pharma - Quick - Step 's Gert Steegmans to take the lead in the general classification .