 A breakaway formed within the first 10 kilometres ( 6 @.@ 2 mi ) of racing . There were seven riders in the break : Thomas De Gendt ( Lotto – Soudal ) , Mike Teunissen ( LottoNL – Jumbo ) , Brice Feillu ( Bretagne – Séché Environnement ) , Jérôme Baugnies ( Wanty – Groupe Gobert ) , Reinier Honig ( Team Roompot ) , Daniele Ratto ( UnitedHealthcare ) , and Pieter Vanspeybrouck ( Topsport Vlaanderen – Baloise ) . The breakaway initially built an eight @-@ minute lead , with De Gendt leading the group over the climbs . The main peloton was led principally by Movistar and Team Katusha . 
