If Geraint Thomas and Team Sky were under any illusions as to the task they faced to keep the yellow jersey, they were reminded with a jolt on stage five.
Attack after attack came in the final few kilometres, with Carlos Betancur (Ag2r-La Mondiale) the man who eventually went clear.
Joined by rising star Bob Jungels (Trek Factory Racing) and Astana’s Jakob Fuglsang, the break stayed away to the finish, where the Colombian took the stage win.
It was an enthralling end to another exciting day in the ‘Race to the Sun’, and another credit to the ASO, whose brave choice of a parcours lacking any time trials or summit finishes has been justified so far.
Thomas kept the yellow jersey in the end, but what did we learn from stage five? Read on for our five observations, and share your own in the RCUK Forum.