As the Women's Tour de France rolls out of the French city of Clermont-Ferrand on Sunday, the Netherlands' Annemiek van Vleuten, who has already won this year's Giro d’Italia and Vuelta cycling races, is back to defend her title. However, a host of contenders are hoping to unseat her before she retires at the end of this year. FRANCE 24 takes a look at van Vleuten and her main challengers.