The first big mountain day saw a Frenchman live the dream. Nans Peters was in the big break of the day then dropped Ilnur Zakarin before the Peyresourde to solo to the finish in Loudenvielle. Adam Yates held onto the yellow jersey by the skin of his teeth.

Race Report: AG2R-La Mondiale's Nans Peters took a fine first professional victory on stage 17 to Anterselva. The Frenchman went with the early break, and then on the run-up to the final climb, he took his leave of his compatriots to solo to the finish. The overall didn't change, although there was a late skirmish from overall leader, Movistar's Richard Carapaz.